Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f9cdbeaee0d4a0df…

MALICIOUS

Office (OLE)

51.0 KB Created: 2007-09-05 15:10:00 Authoring application: Microsoft Word 11.0
MD5: e63bac2a932b8f422e92b4c4cc45c4e3 SHA-1: f7744f5668cd42c1af2790df0641e501c213982d SHA-256: f9cdbeaee0d4a0dfef2ba9fd80356d88ee066b2f407c6636fb5f9736714112bb
240 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing VBA macros, as indicated by the OLE_VBA_MACROS heuristic. The presence of a critical OLE_VBA_SHELL firing suggests that the macros attempt to execute external commands. The embedded artifact 'macros.bas' is identified as a VBA macro. The ClamAV detections (Doc.Trojan.Marker-31 and Doc.Trojan.Marker-3) further confirm its malicious nature. The document body, presented as a press release, is a common lure to trick users into enabling macros. The primary intent appears to be the execution of a second-stage payload via the Shell() function.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-31
  • 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.
  • 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
4d5b19fe208279705ac666dfe279f0d9a744a6642e43f76e5eadac9b8fab86df		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5484 bytes
Detection
ClamAV: Doc.Trojan.Marker-3
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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