Office (OLE) / .DOC malware analysis — malicious · dbad5f1e3f4524ab

MALICIOUS

Office (OLE) / .DOC

45.5 KB Created: 2023-10-09 16:10:00 Authoring application: Microsoft Office Word First seen: 2023-10-10

MD5: 03199d2ac72ca39a21917fe349a67e88 SHA-1: 63a145b0e3e5e5cd3fdebc1e615ff10ca46c149d SHA-256: dbad5f1e3f4524ab951f56aff1086b7283c4f78ac685d72765ae644f1f22d9b4

264 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate/Decode Files or Information

The sample contains obfuscated VBA macros, including an AutoOpen function, which is a common technique for initial execution. The script decodes a string and uses GetObject to create and execute a payload, likely downloading and running a second-stage malicious file. The presence of an obfuscated auto-exec loader and the ClamAV detection strongly indicate malicious intent.

Heuristics 8

Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Doc.Malware.Valyria-10016896-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10016896-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact info 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.
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` `9a83b81fdea54d368c52d4376643f633568bc92b56fa9698259975e01028cedd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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