Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e16832ab61f6efd3…

MALICIOUS

Office (OLE)

64.0 KB Created: 2002-09-27 13:13:00 Authoring application: Microsoft Word 10.0
MD5: 131205c14612a6c4f5ce5e532d18a687 SHA-1: 5fae689054205be9be105adda3978a4fadaf4850 SHA-256: e16832ab61f6efd37136cce6344826f05bdf7129d2a21d5b831d4c3f43b854ee
360 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a Microsoft Word document containing VBA macros, specifically triggering AutoOpen and Document_Open. Critical heuristics indicate the use of the Shell() function for execution, and ClamAV detections (Doc.Trojan.Marker-31, Doc.Trojan.Eight941-1) confirm its malicious nature. The primary attack vector involves the execution of a VBA macro, likely to download and run a secondary payload, as suggested by the 'macros.bas' artifact and the Shell() call.

Heuristics 8

  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
44cb51983c7483e160cd9320ccc9d85b98e2dbb9e19a31a59651f7806aebbb73		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 33999 bytes
Detection
ClamAV: Doc.Trojan.Eight941-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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