Win.Dropper.Agent-34641 — Office (OLE) malware analysis

Static analysis result for SHA-256 995d5da7bf0f1952…

MALICIOUS

Office (OLE)

659.0 KB Created: 2009-02-16 23:49:00 Authoring application: Microsoft Office Word
MD5: 9cb5247fe9eb779b540db420954a8a0c SHA-1: e7f8760955ba4fb1ad5f12e17d37bb6f7216ac50 SHA-256: 995d5da7bf0f195206f11aa2ca3ab00e4cee7c2947b6d811c8355fc404d3c122
408 Risk Score

Malware Insights

Win.Dropper.Agent-34641 · confidence 95%

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

The sample contains VBA macros, including a Document_Open macro that utilizes WScript.Shell to execute commands. This indicates the document is designed to download and execute a second-stage payload, likely from the embedded 'macros.bas' file. The ClamAV detection name 'Win.Dropper.Agent-34641' further supports this assessment.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Win.Dropper.Agent-34641 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Agent-34641
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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.
  • 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
ddf1f5f9417540d06334edd172d746e16fe1c30525f232963a87c77ea9c7d94c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 161616 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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