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BKDR_SIMBOT.UKKT

February 21, 2014
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

180,224 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 Feb 2014

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:

  • %User Profile%\Local Settings\wb32.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other System Modifications

This backdoor deletes the following files:

  • %User Profile%\Local Settings\wb32.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Dropping Routine

This backdoor drops the following files:

  • %User Startup%\wb32.lnk
  • %User Temp%\1101812
  • %User Temp%\1101812.lz
  • %User Temp%\1138828
  • %User Temp%\1138828.lz
  • %User Temp%\1155875
  • %User Temp%\1155875.lz

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.9.4:80/page.jsp?lv=nuyfqu1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?fr=lnjnlt1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?kb=peskav1161670G36E1
  • http://{BLOCKED}.9.4:80/parse.jsp?ql=finjcu1161670G36E1
  • http://{BLOCKED}.9.4:80/login.jsp?fq=tgaxwo1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?wp=dloata1161670G36E1
  • http://{BLOCKED}.9.4:80/security.jsp?on=cjlicb1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?et=kdatyl1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?dn=nczdhv1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?tt=ppxdkt1161670G36E1
  • http://{BLOCKED}.9.4:80/login.jsp?gr=enluzc1161670G36E1
  • http://{BLOCKED}.9.4:80/security.jsp?oy=eilbsu1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?vj=byksxg1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?ms=rdhiav1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?et=egmrii1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?kq=lwcaqe1161670G36E1
  • http://{BLOCKED}.9.4:80/login.jsp?sb=bjlous1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?kp=xdebpc1161670G36E1
  • http://{BLOCKED}.9.4:80/index.jsp?nk=msymfn1161670G36E1
  • http://{BLOCKED}.9.4:80/index.jsp?jm=fxqxlv1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?fz=pnkyzn1161670G36E1
  • http://{BLOCKED}.9.4:80/process.jsp?vj=otqcop1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?hw=xybaxz1161670G36E1
  • http://{BLOCKED}.9.4:80/default.jsp?cj=khiqje1161670G36E1
  • http://{BLOCKED}.9.4:80/about.jsp?yq=ehzhve1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?mu=uywknq1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?or=ibdngg1161670G36E1
  • http://{BLOCKED}.9.4:80/security.jsp?qa=gnjrxt1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?ae=uhgqhp1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?qy=dtysqy1161670G36E1
  • http://{BLOCKED}.9.4:80/index.jsp?fb=vahzce1161670G36E1
  • http://{BLOCKED}.9.4:80/security.jsp?by=vdqdox1161670G36E1
  • http://{BLOCKED}.9.4:80/index.jsp?ln=tnrdla1161670G36E1
  • http://{BLOCKED}.9.4:80/index.jsp?yg=gjdejx1161670G36E1
  • http://{BLOCKED}.9.4:80/process.jsp?kq=ypovig1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?kj=iqghto1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?my=bbweng1161670G36E1
  • http://{BLOCKED}.9.4:80/default.jsp?po=kmagdn1161670G36E1
  • http://{BLOCKED}.9.4:80/login.jsp?wb=jappeg1161670G36E1
  • http://{BLOCKED}.9.4:80/security.jsp?bj=abzzpn1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?ow=pznzmv1161670G36E1
  • http://{BLOCKED}.9.4:80/parse.jsp?zn=villrb1161670G36E1
  • http://{BLOCKED}.9.4:80/process.jsp?in=okqevd1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?lz=wnwyhn1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?vd=drpurr1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?ct=fyzbit1161670G36E1
  • http://{BLOCKED}.9.4:80/process.jsp?an=rotkxd1161670G36E1
  • http://{BLOCKED}.9.4:80/about.jsp?yg=zaumov1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?mn=njvayw1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?os=enppzg1161670G36E1
  • http://{BLOCKED}.9.4:80/index.jsp?zh=syfosk1161670G36E1
  • http://{BLOCKED}.9.4:80/parse.jsp?in=mgoabw1161670G36E1
  • http://{BLOCKED}.9.4:80/about.jsp?yl=rcwuop1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?fs=ueojgc1161670G36E1
  • http://{BLOCKED}.9.4:80/about.jsp?hc=dgncem1161670G36E1
  • http://{BLOCKED}.9.4:80/security.jsp?rb=dpnfbb1161670G36E1
  • http://{BLOCKED}.9.4:80/login.jsp?mo=euihlq1161670G36E1
  • http://{BLOCKED}.9.4:80/about.jsp?vo=vmlspp1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?cv=kwypfd1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?vr=tpgyuc1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?jl=wnmpvh1161670G36E1
  • http://{BLOCKED}.9.4:80/page.jsp?cd=nbosfk1161670G36E1
  • http://{BLOCKED}.9.4:80/process.jsp?gk=gochmg1161670G36E1
  • http://{BLOCKED}.9.4:80/about.jsp?mq=rodmbx1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?lg=vmbpwn1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?cg=iacwuj1161670G36E1
  • http://{BLOCKED}.9.4:80/default.jsp?wg=yuicme1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?dw=liryco1161670G36E1
  • http://{BLOCKED}.9.4:80/default.jsp?qb=lzyvyc1161670G36E1
  • http://{BLOCKED}.9.4:80/login.jsp?fi=iedzft1161670G36E1
  • http://{BLOCKED}.9.4:80/about.jsp?jz=cnxxin1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?ee=uybrbt1161670G36E1
  • http://{BLOCKED}.9.4:80/login.jsp?kl=znolhb1161670G36E1
  • http://{BLOCKED}.9.4:80/user.jsp?lx=qpvftn1161670G36E1
  • http://{BLOCKED}.9.4:80/process.jsp?vh=enwqnt1161670G36E1
  • http://{BLOCKED}.9.4:80/parse.jsp?cr=dsvukk1161670G36E1
  • http://{BLOCKED}.9.4:80/index.jsp?pp=abykon1161670G36E1
  • http://{BLOCKED}.9.4:80/default.jsp?rp=qigghu1161670G36E1
  • http://{BLOCKED}.9.4:80/parse.jsp?hc=firkrw1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?zq=aqctkk1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?qw=nahgle1161670G36E1
  • http://{BLOCKED}.9.4:80/query.jsp?lq=zdwyft1161670G36E1
  • http://{BLOCKED}.9.4:80/security.jsp?oi=xvrwrn1161670G36E1

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

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

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %User Startup%\wb32.lnk
  • %User Temp%\1101812
  • %User Temp%\1101812.lz
  • %User Temp%\1138828
  • %User Temp%\1138828.lz
  • %User Temp%\1155875
  • %User Temp%\1155875.lz

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_SIMBOT.UKKT. 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 4

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\Local Settings\wb32.exe


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