Office (OLE) / .DOCX malware analysis — malicious · 01a4a8f7962a076f

MALICIOUS

Office (OLE) / .DOCX

94.5 KB Created: 2024-12-16 06:28:00 Authoring application: Microsoft Office Word

MD5: 0e9896e59a862c48c6543c7cb0c8b58d SHA-1: 4681d90574c5644de87641b298b020f0dc076c06 SHA-256: 01a4a8f7962a076f7a3b71d5d261bc378e0901f0f46eb9d1f453609d3da63e1e

412 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Reverse Engineer

The sample contains a Document_Open macro that uses WScript.Shell and CreateObject to execute obfuscated code. This script likely downloads and executes a second-stage payload, as indicated by the use of Shell() and the presence of encrypted strings that appear to be part of a decryption routine. The macro is heavily obfuscated, suggesting an attempt to evade detection.

Heuristics 12

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
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.
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
CallByName call high OLE_VBA_CALLBYNAME

CallByName 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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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` `552c8e47fcaa3b69938ba7994c6c376b50d03e783e665b84861909fdc0aa123c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	88201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 46 long base64-like blob(s).

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