TROJ_LOCOTOUT.BS

January 23, 2014
 Analysis by: Sabrina Lei Sioting
 ALIASES:

Win32:Pocardler-B [Spy] (Avast), Win32/Spy.POSCardStealer.L (Eset), Trojan.Win32.Locotout (Ikarus), Backdoor.Win32.SrvCmd.f (Kaspersky), Trojan:Win32/Locotout.gen!A (Microsoft), Troj/Bckdr-RQD (Sophos)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

122,880 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Jan 2014

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Autostart Technique

This Trojan 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\
Enum\Root\LEGACY_CISCOSERVICE
NextInstance = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000
Service = "CiscoService"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000
Legacy = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000
ConfigFlags = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000
Class = "LegacyDriver"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000
ClassGUID = "{GUID}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000
DeviceDesc = "CiscoService"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000\Control
*NewlyCreated* = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000\Control
ActiveService = "CiscoService"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService
Type = "110"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService
ImagePath = "{malware path}\{malware name}.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService
DisplayName = "CiscoService"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService
FailureActions = "{hex values}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService\Security
Security = "{hex values}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService\Enum
0 = "Root\LEGACY_CISCOSERVICE\0000"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService\Enum
Count = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService\Enum
NextInstance = "1"

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_CISCOSERVICE\
0000\Control

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService\Security

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\CiscoService\Enum

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.542.02

FIRST VSAPI PATTERN DATE:

15 Jan 2014

VSAPI OPR PATTERN File:

10.543.00

VSAPI OPR PATTERN Date:

16 Jan 2014

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\Enum\Root
    • LEGACY_CISCOSERVICE
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • CiscoService

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_LOCOTOUT.BS. 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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