Office (OLE) / .DOC malware analysis — malicious · f08ec05653e37918

MALICIOUS

Office (OLE) / .DOC

179.3 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0

MD5: 36c1bf164272c17d3dfcfa3f8cf44f5f SHA-1: 89b24c93505044ffc8d61aa1d05a3011dcd62b9a SHA-256: f08ec05653e3791845754942b5291904151a4486d3ce7f8abfe099cae4db71dc

320 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1105 Ingress Tool Transfer

The OLE document exhibits a significant slack space anomaly and critically contains an embedded PE executable. Heuristics indicate the use of Windows API functions such as VirtualAlloc, LoadLibrary, and GetProcAddress, commonly employed by malware to load and execute code. The embedded executable, detected by ClamAV as Win.Trojan.Agent-681062, is the primary indicator of malicious intent, suggesting the document serves as a dropper for further malicious activity.

Heuristics 7

Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
ClamAV: Win.Trojan.Agent-681062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-681062
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.
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 183,556 bytes but its declared streams total only 94,801 bytes — 88,755 bytes (48%) 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).
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_0001c600.exe` `a07dcd06f7fb0623520e5099c716ee160cb75bb13912a7738a218fdce715a7fb`	embedded-pe	Office MZ+PE at offset 0x1C600	67332 bytes
Detection ClamAV: Win.Trojan.Agent-681062 Obfuscation or payload: unlikely

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