Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 99fd2b9d868f531e…

MALICIOUS

Office (OLE)

45.5 KB Created: 2000-03-30 10:54:00 Authoring application: Microsoft Word 8.0
MD5: 8943cddb87b7adb97c0d54ba796dbfe0 SHA-1: b64f12e6c3d1692342a7d6c863ab8f61a716dedb SHA-256: 99fd2b9d868f531e97f55646fde1ec02a5dc587149e5aeabc3f9ed62f29ed0ad
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature Doc.Trojan.Ethan-20, and an extracted artifact also triggered ClamAV with Doc.Trojan.Ethan-1. The document body contains text related to risk criticality assessment, which appears to be a lure. No scripts were extracted, but the presence of VBA macros (6272 bytes) suggests potential malicious code execution within the document.

Heuristics 4

  • ClamAV: Doc.Trojan.Ethan-20 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ethan-20
  • 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 46,592 bytes but its declared streams total only 26,163 bytes — 20,429 bytes (44%) 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).
  • 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
c7fe1365a14d88261ba0e269c32cfd7f10ac420c1f7ee748dc7c1377dcca58bf		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6272 bytes
Detection
ClamAV: Doc.Trojan.Ethan-1
Obfuscation or payload: unlikely

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