Office (OLE) / .DOC malware analysis — malicious · 7f338c8ee418b6a6

MALICIOUS

Office (OLE) / .DOC

146.5 KB Created: 2017-10-27 10:11:00 Authoring application: Microsoft Office Word

MD5: b29ca3d3dafff55dc900327614eba266 SHA-1: 8b39a051aad05ed245c615e312be9ab3768fcef5 SHA-256: 7f338c8ee418b6a6f1192a5533d05671ba969eee4f1c4048992c6dd42d2d6819

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample is a Microsoft Office Word document containing VBA macros, specifically an AutoOpen macro, which is a common technique for executing malicious code upon opening the document. The presence of `CreateObject` calls and a large slack space anomaly suggests obfuscation or packing. The document body contains what appears to be corrupted image data and some text fragments that do not form a coherent message, but the presence of the AutoOpen macro and `CreateObject` strongly indicates an intent to execute arbitrary code, likely to download and run a second-stage payload.

Heuristics 6

OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 150,018 bytes but its declared streams total only 89,523 bytes — 60,495 bytes (40%) 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).
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `389b97442cd48c339542aa3e22161a793562611ec206fe192f0da2c6f828cd7f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5840 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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