More on Backdoor.Win32.Breplibot.b

We’ve been analysing the backdoor program which uses the Sony rootkit technology.

Trend Micro has told us that the backdoor was mass mailed using spamming technologies. The message sent was as follows:

Message subject:

Requesting Photo Approval

Attachment name:

article_december_3621.exe

Message body:

Breplibot.b is 10240 bytes in size, and packed using UPX.

When launching, the backdoor copies itself to the Windows system directory as $SYS$DRV.EXE. Using this name makes it possible for the rootkit technology used by Sony to hide the activity of the malicious program. Of course, the backdoor’s activity will only be hidden if the ‘Sony rootkit’ has been installed on your computer.

Once launched, the backdoor creates the following system registry key:

[HKEY_LOCAL_MACHINE]
“WkbpsevaXImgvkwkbpXSmj`kswXGqvvajpRavwmkjXVqj”=”$SYS$DRV.EXE”

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Kaspersky researchers reveal previously undocumented malware attributed to Mirage Kitten (UNC1549, Smoke Sandstorm, Nimbus Manticore): NightLedger backdoor, ArcBridge, and BridgeHead tunneling tools.