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

Static analysis result for SHA-256 9e087dc7ee033dc5…

MALICIOUS

Office (OLE) / .EXE

43.0 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0
MD5: 39339e503056fd1bfb16d8a8e661eb87 SHA-1: a33e1ee4e08be59c050a0c7434210504afb1e296 SHA-256: 9e087dc7ee033dc5f790811a74d83c3da87b4e4127b78aae95df546895dcd77a
340 Risk Score

Malware Insights

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

The file is an OLE executable containing VBA macros, specifically triggering AutoOpen and Auto_Close, and utilizing CreateObject. ClamAV detections identify it as Doc.Trojan.Cobra-12 and an extracted artifact as Win.Trojan.C-286. The presence of VBA macros and the 'CreateObject' call strongly suggest the execution of arbitrary code, likely for downloading and executing a second-stage payload.

Heuristics 8

  • ClamAV: Doc.Trojan.Cobra-12 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Cobra-12
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b45f4785ecc1c21ffa6bd47be16a7de6572711391c8935d1a1f488df4db75f10		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4212 bytes
Detection
ClamAV: Win.Trojan.C-286
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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