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

Static analysis result for SHA-256 ec2185aa83dcaafc…

MALICIOUS

Office (OLE) / .A

69.0 KB Created: 1999-03-21 23:48:00 Authoring application: Microsoft Word 8.0
MD5: 4d51921d5f5e2617201135b45f879f18 SHA-1: 71ff268bf1860b24b05d1eaaa05ba433879333bb SHA-256: ec2185aa83dcaafc2016c59968ed6537b0f9e329f140098734b6b456a0d0361c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The file contains VBA macros, and a high-severity heuristic indicates that the 'Document_Open' auto-exec macro is configured to execute shell commands. This suggests the document is designed to run arbitrary code upon opening, likely to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Ded-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ded-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.
  • 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.
  • 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
9ae8af5e059bea9f1523af74e11db0bfe1c7c7b3451cb7f7891a57546a96fbd1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7046 bytes
Detection
ClamAV: Doc.Trojan.Ded-2
Obfuscation or payload: unlikely

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