Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6796650052b756fe…

MALICIOUS

Office (OLE)

78.5 KB Created: 2002-05-24 10:43:00 Authoring application: Microsoft Word 8.0
MD5: bb3986186253b3f534406d510631c38a SHA-1: be287251a57c2f3e1a983a50cd5a2fc704ac9d3e SHA-256: 6796650052b756fe1f37fa38ce9b65e658f5759c317c764f7e53a9a9fe674485
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains VBA macros, including Document_Open and Auto_Close, which are designed to execute automatically. Critical heuristics indicate the use of the Shell() function within the VBA code, suggesting it is intended to download and execute a secondary payload. The ClamAV detections further confirm its malicious nature.

Heuristics 7

  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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.
  • 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
b29143b3ecb87c6e7aae9476cfe7670deab909a1d8006564e6c8dcd9ec82e370		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 73281 bytes
Detection
ClamAV: Doc.Trojan.Eight941-1
Obfuscation or payload: unlikely

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