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TROJ_DLOADER.ADFK

January 28, 2014
 Modified by: Rika Joi Gregorio
 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 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:

729,600 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Nov 2013

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan creates the following folders:

  • %System%\{malware path}\{random number}

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}\
ProxyStubClsid

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}\
ProxyStubClsid32

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}\
TypeLib

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}\
ProxyStubClsid

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}\
ProxyStubClsid32

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}\
TypeLib

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}\
ProxyStubClsid

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}\
ProxyStubClsid32

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}\
TypeLib

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}\
ProxyStubClsid

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}\
ProxyStubClsid32

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}\
TypeLib

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}\
ProxyStubClsid

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}\
ProxyStubClsid32

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}\
TypeLib

It adds the following registry entries:

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}
(Default) = "IDownloadJob"

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}\
ProxyStubClsid
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}\
TypeLib
(Default) = "{AC329328-7EC4-4C34-B672-0A2B90CB9B00}"

HKEY_CLASSES_ROOT\Interface\{19DF2320-6A8A-4942-AC4C-C449949DFC27}\
TypeLib
Version = "1.0"

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}
(Default) = "IRuntime"

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}\
ProxyStubClsid
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}\
TypeLib
(Default) = "{AC329328-7EC4-4C34-B672-0A2B90CB9B00}"

HKEY_CLASSES_ROOT\Interface\{3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}\
TypeLib
Version = "1.0"

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}
(Default) = "IRunningProcess"

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}\
ProxyStubClsid
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}\
TypeLib
(Default) = "{AC329328-7EC4-4C34-B672-0A2B90CB9B00}"

HKEY_CLASSES_ROOT\Interface\{5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}\
TypeLib
Version = "1.0"

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}
(Default) = "IWaitableTask"

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}\
ProxyStubClsid
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}\
TypeLib
(Default) = "{AC329328-7EC4-4C34-B672-0A2B90CB9B00}"

HKEY_CLASSES_ROOT\Interface\{662CA6E1-37D8-4C12-8586-3AC64DF96187}\
TypeLib
Version = "1.0"

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}
(Default) = "IDownloadError"

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}\
ProxyStubClsid
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}\
ProxyStubClsid32
(Default) = "{00020424-0000-0000-C000-000000000046}"

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}\
TypeLib
(Default) = "{AC329328-7EC4-4C34-B672-0A2B90CB9B00}"

HKEY_CLASSES_ROOT\Interface\{8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}\
TypeLib
Version = "1.0"

Dropping Routine

This Trojan drops the following files:

  • %System%\{malware path}\{random numbers}.ini

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}filesnow.info/get/?ver=2.1.0.3244&aid=1553677466&hid=af4ef2cda8d65a1a&rid=1390441301827&data=yKL46KKFIq8pie2XZT3nSE4xiprtFNV6xR59mbISR5bwPk2da%2B9p9wjFmzuazBi%2FMoaHSRAIWPMZLGpAwsN9w2w9NK8XTLsk0JixF0CPejvfyNZMPlJLtYSC9A8VNurtlYQeywN964j38z0LcRZiUZQScnmXD8%2FcgVelX5rLAypep7MM92dSdBCZAVRqQp5ufVHjQa0ETPkix5bB1pR9ScF4qqcKv%2BPatr4w0XWHthg2Z5P8NDQ%2BrThwwQhZaQ1uYxvBwUI%2BuJiibcSA0RNGx%2FaXNWBTrY0AqJquPrDfaBdIX5pN%2BDgQr0R%2FX&report=plXnkKKxp5L1lIn5wy9WZ84NWyBzsW8%2BNh4MC31UO3kMfWQGtt%2Fw%2FyXNZNc%2BI9W4sNI3MdNA%2BScIyeeGQcsMoCpFYfcjeuxpyKrGAxK68jzgIhK1kP%2FF0%2FIN0Hmc03GACyK%2Bp84Yark8ezZVBUVDDziTxbXfq2Au1p8lG%2BIoYntpAYd9%2FzHaeCIb3Fa13VmA4fGQR442Ar6bm72%2F%2FbxE2pL4E8bFfmczuFk%2FeX9o%2FvOoHhVe4bXW%2BC%2BXbizPc3smulTvbIPlNFR6scwwGc5e3kdso4bpkbBwhSJ7S9JIfROJv3CnGiLaag4O1Ja%2Fu%2FUmngkTV

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.544.06

FIRST VSAPI PATTERN DATE:

25 Nov 2013

VSAPI OPR PATTERN File:

10.545.00

VSAPI OPR PATTERN Date:

26 Nov 2013

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

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_CLASSES_ROOT\Interface
    • {19DF2320-6A8A-4942-AC4C-C449949DFC27}
  • In HKEY_CLASSES_ROOT\Interface
    • {3B3F3AAD-FB97-49FF-BFEE-D22869AC4325}
  • In HKEY_CLASSES_ROOT\Interface
    • {5B113BE7-98FF-4DA7-8441-D3AAE3836AE4}
  • In HKEY_CLASSES_ROOT\Interface
    • {662CA6E1-37D8-4C12-8586-3AC64DF96187}
  • In HKEY_CLASSES_ROOT\Interface
    • {8A2DAA70-D6C9-4BAA-B9CA-DE8A9F49CA12}

Step 3

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System%\{malware path}\{random number}

Step 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %System%\{malware path}\{random numbers}.ini

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.ADFK. 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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