Office (OLE) / .DOC malware analysis — malicious · ac90d9197ecd6a28

MALICIOUS

Office (OLE) / .DOC

298.0 KB Created: 2010-05-04 09:51:00 Authoring application: Microsoft Word 9.0

MD5: 5d4aa23edfd9a0b8faef9b2a4d342ab6 SHA-1: 341d7f16ccee7e66e31e2f3048ea1c5d7cf7f851 SHA-256: ac90d9197ecd6a287bf1091f6ee0ed65d466c7a4d7e38d27c0ecaf2e9c3c7b01

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a macro-enabled Word document containing a Document_Open macro, which is a common technique for executing malicious code upon opening. The ClamAV detection of 'Doc.Trojan.Xaler-1' and the heuristic firing for VBA Chr string obfuscation further indicate malicious intent. The document body contains what appears to be statistical data, likely serving as a lure to encourage the user to enable macros.

Heuristics 5

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.
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 305,152 bytes but its declared streams total only 36,941 bytes — 268,211 bytes (88%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
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` `efa52b36aa99aebb3066d2ad4598047c538007bf72a9ce7528664011332b03df`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	130567 bytes
Detection ClamAV: Doc.Trojan.Xaler-1 Obfuscation or payload: likely Carved artifact contains 20 Chr/ChrW string-construction calls.

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