Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fa253aa927772cec…

MALICIOUS

Office (OLE)

38.5 KB Created: 2007-12-11 19:52:00 Authoring application: Microsoft Word 10.1
MD5: 307594b0f694300f91e285dabf2b4a99 SHA-1: 1a4170530f6548665c5ef13469fd4c5c1239930d SHA-256: fa253aa927772ceca20bd29ef5a6ebbc8992d248b223625d5e814e23a3e9eb1e
500 Risk Score

Malware Insights

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

The sample contains VBA macros, including AutoOpen and Auto_Close, which utilize WScript.Shell and CreateObject to execute arbitrary code. The presence of 'SC_STR_WSCRIPT' and 'OLE_VBA_SHELL' heuristics, along with the ClamAV detection 'Doc.Trojan.ColdApe-2', strongly indicates malicious intent. The extracted 'macros.bas' file is likely responsible for downloading and executing a second-stage payload, as suggested by the 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic.

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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