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BKDR64_SIMBOT.SM

December 01, 2014
 ALIASES:

Trojan-Downloader.Win64.Agent.j (KASPERSKY), Trojan-Downloader.Win64.Agent (IKARUS)

 PLATFORM:

Windows

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

  • 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.

  TECHNICAL DETAILS

File Size:

172,544 bytes

Memory Resident:

Yes

Initial Samples Received Date:

20 Nov 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.

Autostart Technique

This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service
Type = "16"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service
ImagePath = ""{malware path and file name}" -k"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service
DisplayName = "Device Enumerator Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service
Description = "Enables applications to transfer and synchronize content using removable mass-storage devices."

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service\Security

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Device Enumerator Service\Enum

It adds the following registry entries:

HKEY_LOCAL_MACHINE\Software\AppDataLow\
Software\Microsoft\svchost
BinData = "{encrypted C&Cs}"

  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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • Device Enumerator Service

Step 5

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\Software\AppDataLow\Software\Microsoft\svchost
    • BinData = "{encrypted C&Cs}"

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR64_SIMBOT.SM. 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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