Office (OLE) malware analysis — malicious · 77c9a7a2d1babd3d

MALICIOUS

Office (OLE)

75.0 KB Created: 2009-01-03 02:31:00 Authoring application: Microsoft Word 10.1

MD5: 7fe9e9b36d44227653f30971eb577c16 SHA-1: 1a8f61ed508206f460eefe6d602c341378e50efd SHA-256: 77c9a7a2d1babd3d00984c40ccaa22908b806cdf0bacaca50798e1da4a2f4d26

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file is a Microsoft Word document containing VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code upon opening. The document body presents a plausible-looking essay assignment to trick the user into enabling macros. The presence of a Document_Open macro strongly suggests the intent is to automatically execute malicious code, likely a downloader, as indicated by the ClamAV detection 'Doc.Trojan.Thus-10'. No specific scripts were extracted for further analysis, but the heuristic firings and ClamAV detection are sufficient to infer a malicious intent.

Heuristics 4

ClamAV: Doc.Trojan.Thus-10 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Thus-10
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.
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
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` `3984d66d1ca6c7885f9914641bdfccb265cac099e19c119b83f407c543d3517b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1962 bytes
Detection ClamAV: Doc.Trojan.Thus-10 Obfuscation or payload: unlikely

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