Office (OLE) / .DOC malware analysis — malicious · b427ca6ab0a79bad

MALICIOUS

Office (OLE) / .DOC

71.0 KB Created: 2010-02-06 15:07:00 Authoring application: Microsoft Word 11.5.3

MD5: 525ce9b3d4e4f55d25db91578b49a301 SHA-1: f0135e41d18750736df5f64599710bf54d96b52c SHA-256: b427ca6ab0a79badeebf6169d7e8c40885ff00a0ae6c95288c87055d5c740f6c

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is a malicious OLE document containing VBA macros. A critical heuristic indicates the use of the Shell() function, which is commonly used to execute arbitrary commands. This suggests the macros are designed to download and execute a second-stage payload. The presence of 'macros.bas' as an extracted artifact further supports this. The document body content appears to be unrelated educational text, likely a lure.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Marker-31
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.
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` `61f129e12b660e189799aa497f6369dd4fb6b4feebcc5abc0a615f0cd5eed26c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6320 bytes
Detection ClamAV: Doc.Trojan.Marker-3 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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