TROJ_AGENT.JAAB

 Analysis by: Kathleen Notario

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan may be downloaded from remote sites by other malware.

  TECHNICAL DETAILS

File Size:

18,420 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Aug 2010

Arrival Details

This Trojan may be downloaded from the following remote site(s):

  • http://web.kfc.ha.cn:6668/Down/my/124.exe

It may be downloaded from remote site(s) by the following malware:

  • JS_AGENT.AYMN

Installation

This Trojan adds the following folders:

  • C:\Winup
  • D:\Winup

It adds the following processes:

  • cmd.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • mutex_cpa_.la
  • mutex_cj1.la
  • mutex_cj2.la

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.ha.cn:6668/Down/ext2/wow.exe - detected as TSPY_GAMETHI.ECF
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/wd.exe - detected as TSPY_LOLYDA.SMF
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/mhxy.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/tl.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/dh2.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext/100013.exe - detected as TROJ_STARTPA.ABB
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/wl.exe - detected as TSPY_GAMETHI.ECE
  • http://{BLOCKED}.ha.cn:6668/Down/ext/fetion016.exe - detected as TROJ_DLOADR.AVQ
  • http://{BLOCKED}.ha.cn:6668/Down/ext/me2430.exe - detected as TROJ_STARTPA.SB
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/rxcq.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext/qm.exe - detected as TSPY_QQPASS.ARJ
  • http://{BLOCKED}.ha.cn:6668/Down/ext/small.exe - detected as TROJ_DROPPR.CK
  • http://{BLOCKED}.ha.cn:6668/Down/ext/baoma.exe - detected as MAL_OTORUN5
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/wmgj.exe - detected as TSPY_GAMETHI.ECG
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/qqhx.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext/dmlq.exe - detected as TROJ_NETINS.SMA
  • http://{BLOCKED}.ha.cn:6668/Down/ext/dianxin.exe - detected as TROJ_DROPPR.CN
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/lszt.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/zx2.exe - detected as TSPY_GAMETHI.ECK
  • http://{BLOCKED}.ha.cn:6668/Down/ext/4002.exe - detected as TROJ_DLOADR.AVO
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/my.exe - detected as TSPY_GAMETHI.ECJ
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/jxsj.exe - detected as TSPY_GAMETHI.ECH
  • http://{BLOCKED}.ha.cn:6668/Down/ext/dk.exe - detected as TROJ_AGENT.SMA
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/qqsg.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/mhzx.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext2/cqsj.exe - detected as TSPY_DOZMOT.SMC
  • http://{BLOCKED}.ha.cn:6668/Down/ext/Alexa.exe - detected as TROJ_DLOADR.AVP
  • http://{BLOCKED}c.ha.cn:6668/Win7/mp/g.css - detected as TROJ_HAMER.D

It saves the files it downloads using the following names:

  • c:\Winup\kb93623.exe

Other Details

This Trojan checks for the presence of the following process(es):

  • 360sd.exe
  • 360tray.exe
  • MPMon.exe
  • Mcshield.exe
  • Ravmond.exe
  • VPTray.exe
  • ashWebSv.exe
  • avguard.exe
  • avp.exe
  • ekrn.exe
  • kissvc.exe
  • kvsrvxp.exe
  • BarClientView.exe
  • Barclient.exe
  • EWay.exe
  • NBClient.exe
  • NxpAuxSvc.exe
  • clsmn.exe
  • mzdclient.exe
  • scon.exe

It does the following:

  • Posts information about the affected system to the URL http://{BLOCKED}.ha.cn:81/admin/count.php
  • Posted information include: MAC address, PC type, antivirus name
  • Executes the command "net stop sharedaccess" to disable the Internet Connection Firewall (ICF)/Internet Connection Sharing (ICS) service
  • Connects to http://{BLOCKED}.ha.cn:6668/Down/list.txt to download a text file

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.402.04

VSAPI OPR PATTERN Date:

22 Aug 2010

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TROJ_AGENT.JAAB

    MAL_OTORUN5
    TROJ_AGENT.SMA
    TROJ_DLOADR.AVO
    TROJ_DLOADR.AVP
    TROJ_DLOADR.AVQ
    TROJ_DROPPR.CK
    TROJ_DROPPR.CN
    TROJ_HAMER.D
    TROJ_NETINS.SMA
    TROJ_STARTPA.ABB
    TROJ_STARTPA.SB
    TSPY_DOZMOT.SMC
    TSPY_GAMETHI.ECE
    TSPY_GAMETHI.ECF
    TSPY_GAMETHI.ECG
    TSPY_GAMETHI.ECH
    TSPY_GAMETHI.ECJ
    TSPY_GAMETHI.ECK
    TSPY_LOLYDA.SMF
    TSPY_QQPASS.ARJ

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.

  • C:\Winup
  • D:\Winup

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.JAAB. 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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