Office (OOXML) / .DOCM malware analysis — malicious · 4719441998c6be7c

MALICIOUS

Office (OOXML) / .DOCM

3.84 MB Created: 2022-06-22 16:30:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-06-22

MD5: 7766dd77f9dc97d1bd657fd269d5d78b SHA-1: cb7fdf089372a68ea9785c0d396158d97e5561ea SHA-256: 4719441998c6be7cf7df74db17758bd998c4834f3b5e6772bdb9cecd67c4de02

202 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is a DOCM file containing VBA macros, specifically an AutoOpen macro that utilizes CreateObject. ClamAV identifies this as a dropper/downloader. Although the provided VBA script excerpts are truncated and do not contain direct download or execution logic, the presence of the AutoOpen macro and the ClamAV detection strongly suggest the intent is to download and execute a second-stage payload. The heuristics indicate a high likelihood of malicious VBA execution.

Heuristics 6

ClamAV: Doc.Dropper.Downloader-6398288-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Downloader-6398288-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
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` `750d835536e2ca9f25c661385806d45865edce15b6e6c3ee97a396e2cc8f20cb`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	8388608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3886 long base64-like blob(s).
`vbaProject_00.bin` `b1c2321c6f12093f1f3bc03ba9cfd7ad2ad70308affe4aae7399bf476a22e8fe`	vba-project	OOXML VBA project: word/vbaProject.bin	8388608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3569 long base64-like blob(s).

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