Office (OOXML) / .XLSX malware analysis — malicious · a08189d1aa01364c

MALICIOUS

Office (OOXML) / .XLSX

212.8 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: c37f1a5dbbc7d287c2bd728c8d18876d SHA-1: 5ba53460c848d92844b6ac475ea8304d46ca8aae SHA-256: a08189d1aa01364cc489c2b30bd60ef12a2a5c2e5e524f22755e503fbec74b86

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing T1071.002 Remote Services - SMB

The file exhibits several indicators of malicious activity, including a VBA macro that executes upon workbook opening, a CreateObject call potentially establishing a shell, and a suspicious extracted artifact. The macro's `Workbook_Open` subroutine immediately triggers execution, likely downloading and executing a secondary payload. The `CreateObject` call suggests attempts to leverage COM objects for command execution or file system access. The overall pattern aligns with a macro-based downloader or a technique to establish a foothold within the system.

Heuristics 4

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `844acbf27365fe182bf1e608bd3446b46560d1846aaa4bcb6328dac4a67d93c1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `16620fdcb5eb5912dcc92828c4ea08982be9ec42e1ae9af1a047e6e6a8aa8723`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 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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