Office (OLE) malware analysis — malicious · 169a6b149b7f4e50

MALICIOUS

Office (OLE)

20.0 KB Created: 1993-09-28 15:08:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14

MD5: 908287132a3fb2704be23fd578704eda SHA-1: 5aa643251ae78ba804b3ed4f8e68c408939f2863 SHA-256: 169a6b149b7f4e506c759a9bfed82d26e393c9489e1c28030ed1c1b47db027bc

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file exhibits characteristics of legacy malware, specifically the presence of WordBasic macro-virus markers and embedded OLE objects with critical static triage findings. ClamAV detections further confirm its malicious nature, identifying it as Win.Trojan.W-283. The embedded artifact 'embedded_office_off00002100.ole' is a key indicator of potential malicious code execution.

Heuristics 4

ClamAV: Win.Trojan.W-283 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.W-283
Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE

A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS

OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMS

This finding applies to a carved embedded Office document found at a nonzero offset inside the submitted file, not directly to the top-level document. The file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the object.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_off00002100.ole`	embedded-office	Embedded OLE/CFB Office body inside ole container at offset 0x2100	12032 bytes
SHA-256: `05aa61064663deac3de35fc929a29452b01cbd8448d3361c77ceebbc9f6650c3`
Detection ClamAV: Win.Trojan.W-283 Obfuscation or payload: unlikely

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