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

Static analysis result for SHA-256 97939e1e8cc91e00…

MALICIOUS

Office (OLE) / .DOC

104.5 KB Created: 2010-08-07 15:44:00 Authoring application: Microsoft Word 10.0
MD5: f5e2fea8cf0a90e750095f0ba5265572 SHA-1: 4712e86128f7ad64098fd8f388e474483e29b8db SHA-256: 97939e1e8cc91e00c3fdb639e6e631a27dffef3f09718fa4f27733be53899877
300 Risk Score

Malware Insights

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

The sample contains a critical OLE_VBA_SHELL firing, indicating the use of the Shell() function within VBA macros. This is further supported by OLE_VBA_PCODE_AUTOEXEC_EXEC and SC_STR_WSCRIPT heuristics. The ClamAV detection of Win.Trojan.Dropper-137 strongly suggests this is a dropper. The AutoOpen macro is present, which is commonly used to initiate malicious actions upon document opening. The document body is heavily corrupted and unreadable, providing no contextual clues.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Win.Trojan.Dropper-137 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-137
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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
dca1dfd698b629d3f287405ebe433afa1e847a5e1d21e38b709341d25578c2dd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 35976 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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