Office (OLE) malware analysis — malicious · 283f85e5be47c54a

MALICIOUS

Office (OLE)

53.0 KB Created: 2008-02-21 15:37:00 Authoring application: Microsoft Word 11.5.3

MD5: a755e49b80bbcfadf62a103fb913b829 SHA-1: 51a92daac270d21e68c22c671131c1b3cfc8cf74 SHA-256: 283f85e5be47c54ac42552d2a5e23e24f4dd5431e6c8504fd3106616b802a57e

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell

The file is identified as malicious by ClamAV with the signature Doc.Trojan.Marker-31. Static analysis revealed VBA macros, specifically a critical 'Shell()' call within the macro code. This suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. The document body, presented as an astronomy problem set, serves as a lure to trick the user into enabling macros. No specific malware family could be confidently identified.

Heuristics 4

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
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` `e9de61365c540b38d722fd5a75b01c6f45e7b83b43a1c15917b223cc6ecf46f3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6156 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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