Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a42d07a25d6b248…

MALICIOUS

Office (OLE)

46.5 KB Created: 2000-06-16 06:09:00 Authoring application: Microsoft Word 8.0
MD5: ef866396e52d878f03cb05b82801397f SHA-1: aba20eb384cb8d3508fa3edead6e2d68cd174533 SHA-256: 2a42d07a25d6b24818ec6d2f9ad95ac0550fd41c02b19c91af7092dd0e4e2453
260 Risk Score

Malware Insights

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

The sample is an OLE document containing a VBA macro that is triggered by the Document_Open event. This macro utilizes the Shell() function, indicating an attempt to execute external code. The ClamAV detection and static triage heuristics confirm the presence of a malicious VBA macro, likely designed to download and execute a second-stage payload, as suggested by the 'Doc.Trojan.Thus-3' signature and the 'VBA auto-exec with execution terms' signal. No specific family could be identified, but the behavior is consistent with a macro-based downloader.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 47,616 bytes but its declared streams total only 19,599 bytes — 28,017 bytes (59%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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
b4edbc285b4919a16ee39a730ab4d83dbe264f3af95b1a3816fe4844c5b4bdde		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3194 bytes
Detection
ClamAV: Doc.Trojan.Thus-3
Obfuscation or payload: likely
Carved artifact contains 16 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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