Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c2a94c990859a72b…

MALICIOUS

Office (OLE)

39.5 KB Created: 2005-10-01 17:11:00 Authoring application: Microsoft Word 9.0
MD5: 0ac6391466de69fc236d37debbfb86b6 SHA-1: 0470ede480b9d32f1e8b02b0c43a0e962387b4d3 SHA-256: c2a94c990859a72b82ce631430d3b0a34e628c93a699a329adee2f5bfc23bca9
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is a Microsoft Word document containing VBA macros, specifically an AutoOpen macro, which is a common technique for executing malicious code upon opening. The document body is crafted to appear as academic course information, likely to trick the user into enabling macros. The presence of 'macros.bas' and the ClamAV detection 'Doc.Trojan.WordDigger-1' strongly indicate malicious intent, likely to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Trojan.WordDigger-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.WordDigger-1
  • 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
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.hse.ru/infopage/persona/s/serova_e_v.htm
    • http://www.hse.ru/kafedry/economy/agrarian_economy/programdoc
    • http://www.hse.ru/kafedry/economy/agrarian_economy/wbwto.zip
    • http://www.hse.ru/kafedry/economy/agrarian_economy/curs/tasks_offset.zip
    • http://www.hse.ru/kafedry/economy/agrarian_economy/prepare.zip

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
85f59860f1dab588fa64cc71b55d513e81ed12e3a2f7729d8fe9f46fcbd5ed11		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4579 bytes
Detection
ClamAV: Doc.Trojan.WordDigger-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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