Office (OLE) malware analysis — malicious · e08a6570a1e86c43

MALICIOUS

Office (OLE)

61.0 KB Created: 2008-09-28 20:49:00 Authoring application: Microsoft Word 11.5.5

MD5: 0ff4be0969ff473aab869cf72ea3ba41 SHA-1: 1709e67335e7580946bb0f506397f81caac8e7cb SHA-256: e08a6570a1e86c43ff790a68d2545861420667583b81e6fadd7920ef5f63a618

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1129 Execution through API

The sample is a Microsoft Word document containing VBA macros, specifically a Document_Open macro, which is a common technique for initial execution. Heuristics indicate the presence of an embedded PDF with suspicious static findings, suggesting it may contain a secondary payload. The ClamAV detection of 'Doc.Trojan.Thus-8' further supports a malicious classification. The VBA macros are likely responsible for extracting and executing the embedded PDF artifact.

Heuristics 5

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Doc.Trojan.Thus-8 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Thus-8
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `95707a737f50b68c3ac8f7f048dacaac0f7c3e364a81ee6ace87879132907c61`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2341 bytes
Detection ClamAV: Doc.Trojan.Thus-8 Obfuscation or payload: unlikely
`icc_00_off000001ae.icc` `2a18161bb96fd584d19e737ce294732789e0e8e6ae8c8e4e5f09f1b138232a63`	pdf-icc-profile	PDF ICC profile at offset 0x1AE	1456 bytes
`polyglot_child_pdf_off00007d8a.pdf` `d7e6a0d77764ff0313fe859c96d7fc51cc7f0f9f442eb45c7cf530f24dcda9a9`	polyglot-child-pdf	Secondary PDF body inside ole container at offset 0x7D8A	30326 bytes

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