Malicious Office (OLE) / .VIR — malware analysis report

Static analysis result for SHA-256 1e5e7c47bb34794b…

MALICIOUS

Office (OLE) / .VIR

518.5 KB
MD5: 84d14f144334eda221ad3f34cab02b4c SHA-1: 80998a1f85f4554c9e0e4ef8a50a8e7590ee5efa SHA-256: 1e5e7c47bb34794b77a2fa171abe80293a57c979803cbe0f0e8f2cdb4cc64e0c
300 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1027 Obfuscated Files or Information

The OLE document exhibits a significant slack anomaly and critically contains an embedded PE executable. Heuristics indicate references to LoadLibrary and GetProcAddress APIs, suggesting dynamic loading of functions, common in malware. ClamAV detection confirms this as Win.Worm.Montague-6915799-0. The embedded executable is the primary IOC.

Heuristics 6

  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Worm.Montague-6915799-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Worm.Montague-6915799-0
  • 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.
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 530,944 bytes but its declared streams total only 0 bytes — 530,944 bytes (100%) 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).

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_00002000.exe
42fafb936e8d3983da6c37e9743e0671b15676acf4b5d4feddb1efb96009ae1d		 embedded-pe Office MZ+PE at offset 0x2000 522752 bytes
Detection
ClamAV: Win.Worm.Montague-6915799-0
Obfuscation or payload: unlikely

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