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

Static analysis result for SHA-256 39e19a6891f4cd50…

MALICIOUS

Office (OLE) / .DOC

49.0 KB Created: 2002-03-01 07:39:00 Authoring application: Microsoft Word 8.0
MD5: 4215e2f688d0246a4f2bdfd9e3614c02 SHA-1: 59e90d265c6dd339a91e4d3441c34a428475854b SHA-256: 39e19a6891f4cd50d68fb7e544ff0966807ca0077e1dfff15dc28a9b8e24f4c2
500 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains VBA macros, including AutoOpen and Auto_Close functions, which are indicative of malicious intent. Critical heuristics indicate the use of Shell() and WScript.Shell, suggesting the macro attempts to execute commands or scripts. The ClamAV detection as 'Win.Trojan.ColdApe-1' further supports its malicious nature. The document body discusses VAT and export procedures, which appears to be a lure to disguise the malicious macro execution.

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: Win.Trojan.ColdApe-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.ColdApe-1
  • 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
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 50,176 bytes but its declared streams total only 20,616 bytes — 29,560 bytes (59%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • 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
  • 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
e0c700fcb9c9426d279a8d714acad208e9578d1fbfe8205f1b6264e68d893776		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10899 bytes
Detection
ClamAV: Doc.Trojan.Marker-1
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 8 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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