Analysis by: RonJay Kristoffer Caragay
ALIASES:

Worm:Win32/Yeltminky.A (Microsoft); W32/Autorun.worm.ff (McAfee); Troj/Buzus-FX (Sophos); Trojan.AvKill (Malwarebytes); W32/Buzus.CQYX!tr (Fortinet); WORM/Abuse.BJ (Avira)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 104,448 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 18 Aug 2015

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This worm drops the following copies of itself into the affected system:

  • %Program Files%\Common Files\Systesm.exe
  • {Drive Letter}:\Systesm.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Systesm = "%Program Files%\Common Files\Systesm.exe"

It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random 1}
DisplayName = "{random 1}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random 1}
Start = "3"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random 1}
ImagePath = \??\%User Temp%\~{random 1}.tmp

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\DrvKiller
DisplayName = "DrvKiller"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\DrvKiller
Start = "3"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\DrvKiller
ImagePath = \??\%Fonts%\{random filename 1}.fon

It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random 1}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\DrvKiller

Other System Modifications

This worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360deepscan.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360hotfix.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360rp.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360rpt.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360Safe.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360safebox.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360sd.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
360tray.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
adam.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AgentSvr.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AntiArp.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AppSvc32.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
arvmon.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AutoGuarder.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
autoruns.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgrssvc.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AvMonitor.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avp.com
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avp.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
CCenter.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ccSvcHst.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
DSMain.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
egui.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ekrn.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
FileDsty.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
findt2005.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
FTCleanerShell.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
HijackThis.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
IceSword.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
iparmo.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Iparmor.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
IsHelp.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
isPwdSvc.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kabaload.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KaScrScn.SCR
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KASMain.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KASTask.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KAV32.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KAVDX.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KAVPFW.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KAVSetup.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KAVStart.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
killhidepid.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KISLnchr.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kissvc.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KMailMon.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KMFilter.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KPFW32.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KPFW32X.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KPFWSvc.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KRepair.COM
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
krnl360svc.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KsLoader.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kswebshield.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KVCenter.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KvDetect.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kvfw.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KvfwMcl.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KVMonXP.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KVMonXP_1.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kvol.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kvolself.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KvReport.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KVScan.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KVSrvXP.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KVStub.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kvupload.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
kvwsc.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KvXP.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KvXP_1.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KWatch.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KWatch9x.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
KWatchX.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
LiveUpdate360.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
loaddll.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
MagicSet.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mcconsol.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mmqczj.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mmsk.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
NAVSetup.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
nod32krn.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
nod32kui.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
PFW.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
PFWLiveUpdate.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
QHSET.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Ras.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Rav.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RavCopy.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RavMon.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RavMonD.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RavStore.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RavStub.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ravt08.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RavTask.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RegClean.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RegEx.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rfwcfg.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RfwMain.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rfwolusr.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rfwProxy.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rfwsrv.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RsAgent.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Rsaupd.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RsMain.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rsnetsvr.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
RSTray.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
runiep.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
safebank.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
safeboxTray.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
safelive.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
scan32.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ScanFrm.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
shcfg32.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
smartassistant.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
SmartUp.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
SREng.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
SREngPS.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
SuperKiller.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
symlcsvc.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
syscheck.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Syscheck2.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
SysSafe.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ToolsUp.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
TrojanDetector.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Trojanwall.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
TrojDie.kxp
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
UIHost.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
UmxAgent.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
UmxAttachment.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
UmxCfg.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
UmxFwHlp.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
UmxPol.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
UpLive.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
WoptiClean.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ZhuDongFangYu.exe
Debugger = "ntsd -d"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
zxsweep.exe
Debugger = "ntsd -d"

Dropping Routine

This worm drops the following files:

  • %Fonts%\{random filename 1}.fon
  • %Fonts%\{random filename 2}.fon
  • %Fonts%\{random filename 3}.fon
  • %Fonts%\{random filename 4}.fon
  • %User Temp%\~{random 1}.tmp
  • {Drive Letter}:\AutoRun.inf

(Note: %Fonts% is the Fonts folder, where it usually is C:\Windows\Fonts on all Windows operating system versions.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This worm connects to the following possibly malicious URL:

  • http://web.{BLOCKED}sta.com/Countxp/count.asp
  • http://down.{BLOCKED}7x.com.cn/windows/xp.txt

It deletes the initially executed copy of itself

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 10.676.05
FIRST VSAPI PATTERN DATE: 14 Mar 2014
VSAPI OPR PATTERN File: 10.677.00
VSAPI OPR PATTERN Date: 15 Mar 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • Systesm = "%Program Files%\Common Files\Systesm.exe"

Step 5

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • {random 1}
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • DrvKiller
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
    • 360deepscan.exe
    • 360hotfix.exe
    • 360rp.exe
    • 360rpt.exe
    • 360Safe.exe
    • 360safebox.exe
    • 360sd.exe
    • 360tray.exe
    • adam.exe
    • AgentSvr.exe
    • AntiArp.exe
    • AppSvc32.exe
    • arvmon.exe
    • AutoGuarder.exe
    • autoruns.exe
    • avgrssvc.exe
    • AvMonitor.exe
    • avp.com
    • avp.exe
    • CCenter.exe
    • ccSvcHst.exe
    • DSMain.exe
    • egui.exe
    • ekrn.exe
    • FileDsty.exe
    • findt2005.exe
    • FTCleanerShell.exe
    • HijackThis.exe
    • IceSword.exe
    • iparmo.exe
    • Iparmor.exe
    • IsHelp.exe
    • isPwdSvc.exe
    • kabaload.exe
    • KaScrScn.SCR
    • KASMain.exe
    • KASTask.exe
    • KAV32.exe
    • KAVDX.exe
    • KAVPFW.exe
    • KAVSetup.exe
    • KAVStart.exe
    • killhidepid.exe
    • KISLnchr.exe
    • kissvc.exe
    • KMailMon.exe
    • KMFilter.exe
    • KPFW32.exe
    • KPFW32X.exe
    • KPFWSvc.exe
    • KRepair.COM
    • krnl360svc.exe
    • KsLoader.exe
    • kswebshield.exe
    • KVCenter.kxp
    • KvDetect.exe
    • kvfw.exe
    • KvfwMcl.exe
    • KVMonXP.kxp
    • KVMonXP_1.kxp
    • kvol.exe
    • kvolself.exe
    • KvReport.kxp
    • KVScan.kxp
    • KVSrvXP.exe
    • KVStub.kxp
    • kvupload.exe
    • kvwsc.exe
    • KvXP.kxp
    • KvXP_1.kxp
    • KWatch.exe
    • KWatch9x.exe
    • KWatchX.exe
    • LiveUpdate360.exe
    • loaddll.exe
    • MagicSet.exe
    • mcconsol.exe
    • mmqczj.exe
    • mmsk.exe
    • NAVSetup.exe
    • nod32krn.exe
    • nod32kui.exe
    • PFW.exe
    • PFWLiveUpdate.exe
    • QHSET.exe
    • Ras.exe
    • Rav.exe
    • RavCopy.exe
    • RavMon.exe
    • RavMonD.exe
    • RavStore.exe
    • RavStub.exe
    • ravt08.exe
    • RavTask.exe
    • RegClean.exe
    • RegEx.exe
    • rfwcfg.exe
    • RfwMain.exe
    • rfwolusr.exe
    • rfwProxy.exe
    • rfwsrv.exe
    • RsAgent.exe
    • Rsaupd.exe
    • RsMain.exe
    • rsnetsvr.exe
    • RSTray.exe
    • runiep.exe
    • safebank.exe
    • safeboxTray.exe
    • safelive.exe
    • scan32.exe
    • ScanFrm.exe
    • shcfg32.exe
    • smartassistant.exe
    • SmartUp.exe
    • SREng.exe
    • SREngPS.exe
    • SuperKiller.exe
    • symlcsvc.exe
    • syscheck.exe
    • Syscheck2.exe
    • SysSafe.exe
    • ToolsUp.exe
    • TrojanDetector.exe
    • Trojanwall.exe
    • TrojDie.kxp
    • UIHost.exe
    • UmxAgent.exe
    • UmxAttachment.exe
    • UmxCfg.exe
    • UmxFwHlp.exe
    • UmxPol.exe
    • UpLive.exe
    • WoptiClean.exe
    • ZhuDongFangYu.exe
    • zxsweep.exe

Step 6

Search and delete this file

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There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Fonts%\{random filename 1}.fon
  • %Fonts%\{random filename 2}.fon
  • %Fonts%\{random filename 3}.fon
  • %Fonts%\{random filename 4}.fon
  • %User Temp%\~{random 1}.tmp
  • {Drive Letter}:\AutoRun.inf

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_YMINKY.SMRP. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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