Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7ceec65b490e48f5…

MALICIOUS

Office (OLE)

59.0 KB Created: 2002-03-12 18:03:00 Authoring application: Microsoft Word 10.0
MD5: d5a12590487fe44700c77ea002f95ec7 SHA-1: 4e99b6b5f4fd3787f03008679dbbc23123e04816 SHA-256: 7ceec65b490e48f5a31edc441e733eee3fb80fc1c0a87389f306afb33498584b
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is an OLE document containing VBA macros. The critical heuristic 'OLE_VBA_SHELL' indicates a Shell() call within the VBA code, and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' confirms this is triggered by the Document_Open auto-execution macro. This suggests the macro is designed to execute arbitrary commands, likely to download and run a secondary payload. The ClamAV detections further confirm its malicious nature.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-31
  • 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 p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
05c8464c53f1c53acb83365264d04bc1e71be2c125b08ab31906f10feec81bc3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 29194 bytes
Detection
ClamAV: Doc.Trojan.Eight941-1
Obfuscation or payload: unlikely

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