Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7a1845bb30156cbf…

MALICIOUS

Office (OLE)

106.0 KB Created: 2010-02-03 17:23:00 Authoring application: Microsoft Word 11.5.5
MD5: 63da2a2080d3c03fc1010e8c3c74c18f SHA-1: e8b2434e4b1b6eeba7f7da51667b8b5aefc82811 SHA-256: 7a1845bb30156cbf1f0218e1c82a52981876c0bf439edc9e6fd2ae98067b9184
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains a VBA macro that executes upon opening the document, as indicated by the 'Document_Open' macro and the 'OLE_VBA_DOCOPEN' heuristic. The macro attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy. This behavior is consistent with a malicious document designed to maintain access to the compromised system.

Heuristics 4

  • ClamAV: Doc.Trojan.Thus-8 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-8
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2f23ddd3d6f1ef886cf3ed642869de200e5704494ea5ed0782cfc25354ad0920		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2333 bytes
Detection
ClamAV: Doc.Trojan.Thus-8
Obfuscation or payload: unlikely

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