ALIASES:

RDN/Generic Downloader.x!jz (McAfee); Trojan Horse (Symantec); Trojan.Win32.Agent.iber (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Generic13.BJTF (AVG)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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: 47,104 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 23 Jun 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\Wmi.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\Wmi.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 Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.106.246:443/index.jsp?ht=jrvhdc1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/query.jsp?ur=uqflon1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/security.jsp?ir=ozddhj1161670G3225
  • http://{BLOCKED}.106.246:443/query.jsp?gs=ncropi1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/login.jsp?ij=zhrgzi1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/user.jsp?ff=vusyqf1161670G3225
  • http://{BLOCKED}.106.246:443/parse.jsp?ce=xihjhq1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/index.jsp?ai=pzbtsh1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/query.jsp?vx=xzxxbm1161670G3225
  • http://{BLOCKED}.106.246:443/default.jsp?ea=fdpvlh1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/security.jsp?df=ijrrvk1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/process.jsp?oy=pepzye1161670G3225
  • http://{BLOCKED}.106.246:443/page.jsp?lq=okbggl1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/user.jsp?jb=wmxxux1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/about.jsp?js=qijyku1161670G3225
  • http://{BLOCKED}.106.246:443/parse.jsp?iy=iiyisy1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/index.jsp?vz=vjjelo1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/parse.jsp?kk=gxaybs1161670G3225
  • http://{BLOCKED}.106.246:443/query.jsp?ps=cdpxjn1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/index.jsp?oy=fnxeou1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/index.jsp?se=iydutm1161670G3225
  • http://{BLOCKED}.106.246:443/about.jsp?iq=fleknn1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/process.jsp?yy=hrwavs1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/query.jsp?ss=ouyiwn1161670G3225
  • http://{BLOCKED}.106.246:443/user.jsp?rb=rxouyj1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/login.jsp?om=jcbtmy1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/user.jsp?cr=mdefbl1161670G3225
  • http://{BLOCKED}.106.246:443/about.jsp?fs=mzysin1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/login.jsp?zi=xiekvr1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/about.jsp?pr=bcqhrn1161670G3225
  • http://{BLOCKED}.106.246:443/process.jsp?rt=clfdtd1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/parse.jsp?rz=dtteir1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/about.jsp?kb=hwkwnh1161670G3225
  • http://{BLOCKED}.106.246:443/process.jsp?ly=cmkuez1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/about.jsp?od=cfojiu1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/parse.jsp?ge=xvuxxb1161670G3225
  • http://{BLOCKED}.106.246:443/user.jsp?qs=dhkgum1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/user.jsp?hi=eltctl1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/parse.jsp?ra=tnkaid1161670G3225
  • http://{BLOCKED}.106.246:443/login.jsp?hb=fhbwwd1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/process.jsp?mb=qiofgt1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/query.jsp?yl=ozjgon1161670G3225
  • http://{BLOCKED}.106.246:443/login.jsp?ql=fbrikr1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/parse.jsp?az=wdtgtt1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/page.jsp?de=onwvlg1161670G3225
  • http://{BLOCKED}.106.246:443/query.jsp?qy=vrejnc1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/process.jsp?an=lgyrzo1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/about.jsp?wu=ivxesy1161670G3225
  • http://{BLOCKED}.106.246:443/user.jsp?bq=eolfes1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/parse.jsp?at=puyset1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/process.jsp?md=fpiiim1161670G3225
  • http://{BLOCKED}.106.246:443/page.jsp?eu=bowggi1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/query.jsp?iq=xayluv1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/index.jsp?ry=ddylhc1161670G3225
  • http://{BLOCKED}.106.246:443/login.jsp?os=fqjlpz1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/parse.jsp?zo=cvyoaq1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/about.jsp?kt=svitfe1161670G3225
  • http://{BLOCKED}.106.246:443/index.jsp?ii=rmwxet1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/query.jsp?ca=sfcwpk1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/query.jsp?ch=qxkcfx1161670G3225
  • http://{BLOCKED}.106.246:443/query.jsp?am=cswmcp1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/security.jsp?cb=uxhwgg1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/login.jsp?uv=xlrrdc1161670G3225
  • http://{BLOCKED}.106.246:443/index.jsp?ee=bqgmgv1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/user.jsp?wj=necjfo1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/default.jsp?pg=srprne1161670G3225
  • http://{BLOCKED}.106.246:443/process.jsp?lm=eqozho1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/process.jsp?sh=ujezra1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/login.jsp?pf=vzzjpg1161670G3225
  • http://{BLOCKED}.106.246:443/login.jsp?lc=aisoad1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/login.jsp?zj=caozlg1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/user.jsp?cz=gxcrcj1161670G3225
  • http://{BLOCKED}.106.246:443/default.jsp?bo=gqzstu1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/page.jsp?ue=hyrier1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/login.jsp?bm=ygcuaw1161670G3225
  • http://{BLOCKED}.106.246:443/parse.jsp?xg=viytbx1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:80/security.jsp?qc=trocvq1161670G3225
  • http://taiwan.{BLOCKED}g.us.to:443/index.jsp?xp=oqwlel1161670G3225

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.700

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

Scan your computer with your Trend Micro product to delete files detected as BKDR_SIMBOT.ZTBD-AY. 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 3

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\Wmi.exe


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