Office (OOXML) / .DOCM malware analysis — malicious · 5742962e3b3145ef

MALICIOUS

Office (OOXML) / .DOCM

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

MD5: 69b648565ed2efbd284bccf63e680fcb SHA-1: ff1d75967bc311dc74bfbaa6103f001316821786 SHA-256: 5742962e3b3145ef4c4b3bc3fbc1bfe1e35b53d6f2e8fe53c9a6a3baeea8c84d

202 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is a DOCM document containing VBA macros, specifically an AutoOpen macro which is a common technique for initial execution. The presence of CreateObject calls and the ClamAV detection signature 'Doc.Dropper.Downloader-6398288-0' strongly indicate a downloader or dropper functionality. No specific network IOCs or further payload details were extracted from the provided script content, which appears to be truncated and contains only document manipulation routines.

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` `6bf5a67ea3bdeb1a02316e13da42f459d85632f74c76fc66410bd833f6938875`	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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