Office (OOXML) / .DOCX malware analysis — malicious · f77205a9238a123b

MALICIOUS

Office (OOXML) / .DOCX

129.3 KB

MD5: d6cf93b031f2e3b8758c41f5ce665a1f SHA-1: dd3040f2b246bf729de40573721442d8efd4e070 SHA-256: f77205a9238a123b74b764be6e2132777e1f3eda9c515f31219387c45629e3ea

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The OOXML file contains VBA macros, specifically a Document_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary commands upon opening the document. The presence of embedded OLE objects and the suspicious extracted artifact 'macros.bas' further support the malicious nature of the file, likely serving as a downloader or initial execution vector.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high 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.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c1c18958f2c4c14996ae6b5f8c9e5e675046bf1691e213c01c5b81f04e13711d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3275 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ooxml_oleobject_00.bin` `4f5b450af343d4405de13d65a3be4001df383dd7a82e66d36c7d18f9c93b2dbd`	ooxml-ole-object	OOXML embedded OLE part: word\embeddings\oleObject3.bin	20708 bytes
`ooxml_oleobject_01.bin` `da757853f4940996087b6755dd65eba3c9c5bdce29deebf5ded92e752ab6896c`	ooxml-ole-object	OOXML embedded OLE part: word\embeddings\oleObject1.bin	261842 bytes
`vbaProject_00.bin` `a4e458961c4617f05a6f63d01f99713f68b16b6ee96ac72ca8e1c82001779d89`	vba-project	OOXML VBA project: word\vbaProject.bin	14848 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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