Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b4017d552d85a3d8…

MALICIOUS

Office (OLE)

58.5 KB Created: 2009-09-13 23:33:00 Authoring application: Microsoft Word 11.5.0
MD5: 3ffc3e6e873fec4f089c3609feca2663 SHA-1: 2dcf8adeadfb775a39034f9302fe15af95731251 SHA-256: b4017d552d85a3d8c4800bec8cd7d41d340ef79c496dfb144797df0018fd635e
500 Risk Score

Malware Insights

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

The document contains VBA macros, including AutoOpen and Auto_Close functions, which are designed to execute automatically. Critical heuristics indicate the use of WScript.Shell and Shell() calls, suggesting the macros are intended to run external commands or scripts. The presence of 'macros.bas' as an extracted artifact further supports this. The document body's content about filling out checks and a check register appears to be a social engineering lure for a financial scam.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Doc.Trojan.ColdApe-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.ColdApe-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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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
9524f6296ef6ec9dd3f9771751397371930f6ed32482ca9a5408a6ab7a7bd6c7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6136 bytes
Detection
ClamAV: Doc.Trojan.ColdApe-2
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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