DR/Zapchast.AI - Dropper

See also

Summary

Full description

Statistics

Virus:	DR/Zapchast.AI
Date discovered:	04/08/2008
Type:	Dropper
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	722.407 Bytes
MD5 checksum:	7824396444ea3c178cc677b6de9f49c8
IVDF version:	7.00.05.209 - Mon, 04 Aug 2008 11:21 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Symantec: Backdoor.Trojan
   • Mcafee: IRC/Flood.gen.dr
   • Kaspersky: not-a-virus:Client-IRC.Win32.mIRC.601
   • TrendMicro: Mal_Zap
   • F-Secure: Backdoor.Win32.mIRC-based
   • Sophos: Mal/Zapchas-C
   • Panda: Bck/mIRCBased.BC
   • Grisoft: IRC/BackDoor.Flood
   • VirusBuster: Backdoor.MIRC-based.X
   • Eset: IRC/Cloner.BI trojan
   • Bitdefender: Trojan.Mirchack.A

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Drops files
   • Drops malicious files

Files It creates the following directories:
   • C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\
   • C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\download

The following files are created:

– Non malicious files:
   • C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\aliases.ini;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\control.ini;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\Desktop.ini;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\fullname.txt;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\identd.txt;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\instsrv.exe;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\mirc.ico;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\mirc.ini;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\popups.txt;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\remote.ini;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\servers.ini;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\svchost.exe;
      C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\users.ini

– C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\a.reg Further investigation pointed out that this file is malware, too. Detected as: IRC/Cloner.BI

– C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\csrss.exe Detected as: BDS/mIRC-593262.A

– C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\script.ini Detected as: IRC/Zapchast.AI

– C:\RECYCLER\S-1-5-21-606747145-1085031214-725345543-500\sup.exe Furthermore it gets executed after it was fully created. Detected as: DR/Runner.B

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• UPX

See a brief description here.

Description inserted by Thomas Wegele on Mon, 11 Aug 2008 12:48 (GMT+1)
Description updated by Philipp Wolf on Mon, 11 Aug 2008 13:21 (GMT+1)

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