W97M.Blood.A — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 249f863226525566…

MALICIOUS

Office (OLE) / .DOC

36.0 KB Created: 2001-06-16 05:22:00 Authoring application: Microsoft Word 9.0
MD5: 8cd23603a72f1dcbdf22e03d49c17f83 SHA-1: f970fea6b876ba8d133900ceb55a14bf0c307335 SHA-256: 249f86322652556606ef051a617fa9a473cf6ec0c8cccdb5a7ee7082c430695d
368 Risk Score

Malware Insights

W97M.Blood.A · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1105 Ingress Tool Transfer

The sample is a malicious Word document containing VBA macros. The AutoOpen macro disables macro security settings and attempts to write a file named 'blood.sys' to the Windows directory. It also attempts to import this file into the NormalTemplate, suggesting an attempt at persistence or further infection. The ClamAV detections 'Win.Trojan.Pivis-2' and 'Doc.Trojan.Petman-1' further confirm its malicious nature.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
322dcca836a474f36dfce095d94c2c4cc998075e1a4b1aacaab6d08937035582		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9555 bytes
Detection
ClamAV: Doc.Trojan.Petman-1
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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