W97M.Wolf Office (OLE) / .DOC malware analysis — malicious · ac9feaf6626f186b

MALICIOUS

Office (OLE) / .DOC

40.0 KB Created: 2002-02-24 14:00:00 Authoring application: Microsoft Word 9.0

MD5: 456d71a02c519c6a1f13fa9ffc899f2e SHA-1: 534f5ae68f8634c6c69a5b40ad131a4bf674d000 SHA-256: ac9feaf6626f186bd557eb90c494a7b596420954d9d41c61219310ef6e109f62

360 Risk Score

Malware Insights

W97M.Wolf · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros with AutoOpen and AutoClose functions, indicative of macro-based malware. The 'Shell()' call within the AutoOpen macro suggests the execution of external commands or payloads. The script attempts to copy itself to the NormalTemplate and then to the active document, potentially for persistence or spreading. The ClamAV detection as 'Win.Trojan.Kallisti-1' further supports its malicious nature. The script's intent is to establish persistence and potentially download further payloads, as indicated by the 'Shell()' call and the file copying mechanism.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Win.Trojan.Kallisti-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Kallisti-1
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.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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` `d638311c554c46a500bc49e71e988777d3bfa24a9cb6484ee5c21d0cb60cb86c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2489 bytes
Detection ClamAV: Win.Trojan.C-286 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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