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

Static analysis result for SHA-256 b3aa772c9b0807df…

MALICIOUS

Office (OLE) / .EXE

40.0 KB Created: 1999-11-15 11:50:00 Authoring application: Microsoft Word 8.0
MD5: ad40a9ac69d04eee0f52038d98e2279c SHA-1: eb55435be978d7117141219877b8ba90d9450995 SHA-256: b3aa772c9b0807dfcdb3b3ed35a121b153a0734cb87bc61bf407f2deb1c94c6d
360 Risk Score

Malware Insights

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

The file contains VBA macros, including a Document_Open macro that utilizes Shell() and CreateObject() calls. This indicates the macro is designed to execute arbitrary code, likely to download and run a second-stage payload. The ClamAV detections 'Win.Trojan.KillCMOS-13' and 'Win.Trojan.wmvg-1' further confirm its malicious nature.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Win.Trojan.KillCMOS-13 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.KillCMOS-13
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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
22b0a8f1fddfa0f364f739a1645d51ac1dc312d56820bab363700893eddea046		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19142 bytes
Detection
ClamAV: Win.Trojan.wmvg-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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