Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cfc5751177a38505…

MALICIOUS

Office (OLE)

74.0 KB Created: 2000-04-06 14:51:00 Authoring application: Microsoft Word 8.0
MD5: c153b9002d2f2ff0885b5335fdcfa326 SHA-1: 15d34c28cc3a8cbe5bb301554ae4bd3637ad21f8 SHA-256: cfc5751177a385058ea6ea1c97f6240885e803b607bf1de854cdb7db4d628beb
540 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1087.001 Local Accounts T1059.003 Windows Command Shell

The sample contains VBA macros, including an AutoOpen macro, that utilize WScript.Shell to execute commands. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' suggests a social engineering pretext. The embedded VBA macros are likely responsible for downloading and executing a second-stage payload, as indicated by the 'OLE_VBA_SHELL' and 'OLE_VBA_WSCRIPT' firings. The ClamAV detection of 'Win.Trojan.ColdApe-1' further supports its malicious nature.

Heuristics 12

  • 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
  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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
05c4b31c70ecef4b87b59544a48558328a4df1b988e98aaf8658542d79e32ad5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 40853 bytes
Detection
ClamAV: Doc.Trojan.Marker-1
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 9 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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