Submission Summary:

What's been foundSeverity Level
A network-aware worm that uses known exploit(s) in order to replicate across vulnerable networks.
MS04-012: DCOM RPC Overflow exploit - replication across TCP 135/139/445/593 (common for Blaster, Welchia, Spybot, Randex, other IRC Bots).
MS04-011: LSASS Overflow exploit - replication across TCP 445 (common for Sasser, Bobax, Kibuv, Korgo, Gaobot, Spybot, Randex, other IRC Bots).
Capability to perform DoS attacks against other computers.
Capability to terminate Antivirus, Firewall and other security related processes.
Replication across networks by exploiting weekly restricted shares (common for Randex family of worms).
Communication with a remote IRC server.
Creates a startup registry entry.
Contains characteristics of an identified security risk.


Technical Details:


Possible Security Risk

Threat CategoryDescription
A network-aware worm that attempts to replicate across the existing network(s)
A malicious trojan horse or bot that may represent security risk for the compromised system and/or its network environment


File System Modifications

#Filename(s)File SizeFile HashAlias
1 %System%\arhkstnhsc.exe 115,712 bytes MD5: 0xA6169CD22AC60CE0AD4E83739A27CBB1 Packed/FSG [PCTools]
W32.Spybot.Worm [Symantec]
WORM_RBOT.GJJ [Trend Micro]


Memory Modifications

Process NameProcess FilenameMain Module Size
arhkstnhsc.exe%System%\arhkstnhsc.exe1,282,048 bytes
[filename of the sample #1][file and pathname of the sample #1]1,282,048 bytes


Registry Modifications


Other details

Remote HostPort Number


Outbound traffic (potentially malicious)


Heuristics Analysis



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