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

Static analysis result for SHA-256 8efd631b3e53e8e9…

MALICIOUS

Office (OLE) / .DOT

78.5 KB Created: 2010-02-26 06:20:00 Authoring application: Microsoft Word 9.0
MD5: 6cf4dae6a3aafc083d24061d1481cfbd SHA-1: 75b8f92f788d7f166d0148701c21522ca3e03990 SHA-256: 8efd631b3e53e8e99790f88eb2672a4b5b3f6620617c655d6d0b91ff9fcf4441
368 Risk Score

Malware Insights

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

The file is a Word template (.DOT) containing VBA macros, including AutoOpen and AutoClose functions. Critical heuristics indicate the presence of Shell() calls and auto-execution of VBA p-code, strongly suggesting the execution of arbitrary commands. ClamAV detections for 'Win.Trojan.Psycho-3' and 'Win.Trojan.C-286' on an extracted artifact further confirm its malicious nature. The macros likely serve to download and execute a second-stage payload.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • 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
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
bb320deaca62b53a7cedb50785290b374e9f7e959e21f03ce76e2a247b3ff73a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8423 bytes
Detection
ClamAV: Win.Trojan.C-286
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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