Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5984a79122c9a974…

MALICIOUS

Office (OLE)

55.5 KB Created: 2001-03-26 00:29:00 Authoring application: Microsoft Word 8.0
MD5: 7ef62603a8d498edd2bd1bf7f1c67469 SHA-1: 45175164e6a5fffeebe5cbe60b4b2001e14a5c52 SHA-256: 5984a79122c9a974368240ccaee5f716e619f12793bdeaacf0fad06d8ef59d75
360 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing malicious VBA macros, specifically triggering AutoOpen and Auto_Close functions. The critical OLE_VBA_SHELL heuristic indicates the presence of a Shell() call within the VBA code, which is used to execute arbitrary commands. The ClamAV detections (Doc.Trojan.Groovie-2 and Doc.Trojan.Groov-1) further confirm its malicious nature. The document body is a seemingly benign invitation for an arts event, serving as a lure. The VBA macros likely download and execute a second-stage payload.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Groovie-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Groovie-2
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4f82d779a001f7d16e778ec785f926d5daff5d77d8e98af5dc1cd7e56185f802		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7884 bytes
Detection
ClamAV: Doc.Trojan.Groov-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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