Office (OLE) / .DO malware analysis — malicious · e18b4a940035f8c2

MALICIOUS

Office (OLE) / .DO

85.0 KB Created: 2001-06-07 06:02:00 Authoring application: Microsoft Word 8.0

MD5: 29ba366e578df8c62684d8ae0d975760 SHA-1: 5bfcf3eba2e65b575bae70b386cea8c1d06c4d65 SHA-256: e18b4a940035f8c2eb89d94f6a5eaa20b7bc49dd3c45a0fddbacb45a0846a7eb

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1505.003 Server Software Component: Visual Basic T1204.002 Malicious File: Malicious File

The sample is an OLE document with a high-slack anomaly and a detected VBA macro. The 'Document_Open' macro and 'CreateObject' call indicate that the macro is designed to execute automatically upon opening. The heuristic 'EXTRACTED_FILE_CLAMAV' with signature 'Doc.Trojan.Seqnum-1' and 'EXTRACTED_FILE_STATIC_TRIAGE' further confirm the malicious nature of an extracted artifact named 'macros.bas'. This suggests the macro is intended to download and execute a second-stage payload.

Heuristics 6

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 87,040 bytes but its declared streams total only 28,241 bytes — 58,799 bytes (68%) 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
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `3bdf69b186842c50fa17a7679212522aeaa17bb9909ba3b8206311723bb45e53`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3925 bytes
Detection ClamAV: Doc.Trojan.Seqnum-1 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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