BKDR_BIFROSE.DWR
VirTool:Win32/VBInject.DD (Microsoft); W32/Rimecud.gen.aw (McAfee); Packed.Generic.307, Trojan.Usuge!gen3 (Symantec); Worm.Win32.VBNA.b (Kaspersky); Virtool.Win32.Vbinject.1 (v) (Sunbelt); Trojan horse Crypt.KEM (AVG)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
159,744 bytes
EXE
Yes
14 May 2013
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system:
- %Windows%\winaps32.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
winaps32 = "%Windows%\winaps32.exe"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
UserInit = "%System%\userinit.exe,%Windows%\winaps32.exe"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Apocalypse
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Apocalypse
Grup = "apocalypse"
HKEY_CURRENT_USER\Software\Apocalypse
Ad = "ap0calypse"
HKEY_CURRENT_USER\Software\Apocalypse
Sifre = "admin"
HKEY_CURRENT_USER\Software\Apocalypse
Delay = "10000"
HKEY_CURRENT_USER\Software\Apocalypse
Baglantilar = "tr.ath.cx:22225;"
HKEY_CURRENT_USER\Software\Apocalypse
MsgGoster = "0"
HKEY_CURRENT_USER\Software\Apocalypse
Buton = "0"
HKEY_CURRENT_USER\Software\Apocalypse
Icon = "0"
HKEY_CURRENT_USER\Software\Apocalypse
Bindir = "0"
HKEY_CURRENT_USER\Software\Apocalypse
Mutex = "pVKMzJlqmF"
HKEY_CURRENT_USER\Software\Apocalypse
Baslangic = "1"
HKEY_CURRENT_USER\Software\Apocalypse
Anahtar = "winaps32"
HKEY_CURRENT_USER\Software\Apocalypse
YuklenenDizin = "%Windows%"
HKEY_CURRENT_USER\Software\Apocalypse
ProgramAdi = "winaps32.exe"
HKEY_CURRENT_USER\Software\Apocalypse
ActiveX = "{7KPBR5UE-R3XQ-0218-G004-4EVQFFG012TR}"
HKEY_CURRENT_USER\Software\Apocalypse
Injecsiyon = "1"
HKEY_CURRENT_USER\Software\Apocalypse
Persistent = "1"
HKEY_CURRENT_USER\Software\Apocalypse
UserMode = "1"
HKEY_CURRENT_USER\Software\Apocalypse
KernelMode = "1"
HKEY_CURRENT_USER\Software\Apocalypse
SafeMode = "1"
HKEY_CURRENT_USER\Software\Apocalypse
Offline = "1"
HKEY_CURRENT_USER\Software\Apocalypse
Melt = "0"
HKEY_CURRENT_USER\Software\Apocalypse
OlderDate = "1"
HKEY_CURRENT_USER\Software\Apocalypse
DisableSafeMode = "1"
HKEY_CURRENT_USER\Software\Apocalypse
Hidden = "1"
HKEY_CURRENT_USER\Software\Apocalypse
System = "1"
HKEY_CURRENT_USER\Software\Apocalypse
Archive = "1"
It deletes the following registry keys:
HKEY_CURRENT_USER\Software\APOCALYPSE
Dropping Routine
This backdoor drops the following files:
- tmp.htm
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Identify and delete files detected as BKDR_BIFROSE.DWR using either the Startup Disk or Recovery Console
Step 3
Delete this registry key
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_CURRENT_USER\Software
- Apocalypse
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
- msvideo
Step 4
Delete this registry value
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\Run
- winaps32 = "%Windows%\winaps32.exe"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Grup = "apocalypse"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Ad = "ap0calypse"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Sifre = "admin"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Delay = "10000"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Baglantilar = "tr.ath.cx:22225;"
- In HKEY_CURRENT_USER\Software\Apocalypse
- MsgGoster = "0"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Buton = "0"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Icon = "0"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Bindir = "0"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Mutex = "pVKMzJlqmF"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Baslangic = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Anahtar = "winaps32"
- In HKEY_CURRENT_USER\Software\Apocalypse
- YuklenenDizin = "%Windows%"
- In HKEY_CURRENT_USER\Software\Apocalypse
- ProgramAdi = "winaps32.exe"
- In HKEY_CURRENT_USER\Software\Apocalypse
- ActiveX = "{7KPBR5UE-R3XQ-0218-G004-4EVQFFG012TR}"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Injecsiyon = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Persistent = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- UserMode = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- KernelMode = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- SafeMode = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Offline = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Melt = "0"
- In HKEY_CURRENT_USER\Software\Apocalypse
- OlderDate = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- DisableSafeMode = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Hidden = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- System = "1"
- In HKEY_CURRENT_USER\Software\Apocalypse
- Archive = "1"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: UserInit = "%System%\userinit.exe,%Windows%\winaps32.exe"
To: UserInit = ""%Windows%\system32\userinit.exe,""
- From: UserInit = "%System%\userinit.exe,%Windows%\winaps32.exe"
Step 6
Search and delete this file
- tmp.htm
Step 7
Scan your computer with your Trend Micro product to delete files detected as BKDR_BIFROSE.DWR. 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.
Step 8
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\Software
- APOCALYPSE
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