Office (OLE) / .DOCX malware analysis — malicious · be6789b6ed58f040

MALICIOUS

Office (OLE) / .DOCX

201.5 KB Created: 1994-03-01 12:45:00 Authoring application: Microsoft Word 8.0

MD5: 7d53179d9dd64b2bdde751698d145a7a SHA-1: 3796613208030ab534435dc5965403645a097ab5 SHA-256: be6789b6ed58f040daf43be3b8003602eed872c1727e820f10e0b9726863b77a

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1059.003 Windows Command Shell

The sample is a Microsoft Word document containing a significant amount of VBA macro code. Heuristics indicate the presence of AutoOpen macros, Shell() calls, and CreateObject/GetObject calls, suggesting malicious intent. The ClamAV detection of 'Doc.Trojan.Across-1' further supports this. The VBA script attempts to modify Office security settings by writing to registry keys such as 'HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security' and 'HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Excel\Microsoft Excel'. The script's obfuscated nature and truncated content prevent a full understanding of its execution flow, but the modifications to security settings are indicative of a downloader or dropper attempting to facilitate further malicious activity.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
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
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject 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.

Filename	Kind	Source	Size
`macros.bas` `819f701c0e03d3a805d6a81115f0bd2330309dc7e4102c10d9c54107d6a59471`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	99471 bytes
Detection ClamAV: Doc.Trojan.Across-1 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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