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

Static analysis result for SHA-256 81ceb40a97533e28…

MALICIOUS

Office (OLE) / .DOC

107.0 KB Created: 2015-06-04 04:46:00 Authoring application: Microsoft Office Word
MD5: 11aa26d1a5463bc2cb1c5a6097e3c798 SHA-1: 69888bdcf69a6daaf8ab86b00c556d117447cfe7 SHA-256: 81ceb40a97533e28574b80abf4a5ea28cfcb9aa119a05027e49e48925012f197
280 Risk Score

Malware Insights

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

The file contains VBA macros, specifically an AutoOpen macro that uses CreateObject and CallByName, indicating it's designed to execute code. The ClamAV detection 'Doc.Dropper.Agent-1537712' strongly suggests a dropper functionality. The VBA code itself appears to be obfuscated and contains functions related to mathematical calculations, but the primary malicious intent is evident from the macro execution and the ClamAV signature.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-1537712 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-1537712
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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
755f983099465ea990906bf7492c482cf920c4aed40900275a52057ed3c035fa		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13447 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 100 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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