Office (OOXML) / .DOCM malware analysis — malicious · 68518c86ab751409

MALICIOUS

Office (OOXML) / .DOCM

5.52 MB Created: 2023-09-07 03:29:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2023-09-12

MD5: 384cee7280a2feec66d823f12097e411 SHA-1: f412980918ce73e8c5d0ab3431889399fd3ffbf5 SHA-256: 68518c86ab7514097e33a0c13353af1111ab659fc10ef4ede2dd00ce7a55123a

290 Risk Score

Malware Insights

MITRE ATT&CK

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

This OOXML document contains a VBA project with an AutoOpen macro, indicating it's designed to execute automatically upon opening. The presence of obfuscated auto-exec loaders and calls to CreateObject and GetObject suggest the macro is intended to download and execute a second-stage payload. The extracted filenames 'macros.bas' and 'vbaProject_00.bin' are also indicative of malicious VBA content.

Heuristics 9

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.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject call
VBA instantiates a COM class by raw CLSID high OLE_VBA_GETOBJECT_CLSID_EVASION

VBA uses GetObject("new:{CLSID}") to instantiate a COM class by raw CLSID rather than a CreateObject ProgID — an uncommon bypass of name-based macro detection.
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 project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b908f6dca5bbdbb41b35ae47f577a0e936a6c83becef15f97837942a83054938`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5063763 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1783 long base64-like blob(s).
`vbaProject_00.bin` `ac86313c93004af276a167aa6c2e2993b0537bff589479fe393620705b958aa9`	vba-project	OOXML VBA project: word/vbaProject.bin	8388608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2208 long base64-like blob(s).

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