Office (OOXML) / .XLSX malware analysis — malicious · 35b258bd0ad35bde

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: d2d71b3fe8e7221758bd639cbed1ae5b SHA-1: b5598a2d37275274eb70a200366b88336373fab2 SHA-256: 35b258bd0ad35bde9b88915b5b9b8e06af1a56f54428dc82b9a4e82a53c9e201

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 contains a VBA macro that executes upon workbook opening, a common tactic for delivering malicious payloads. The presence of `CreateObject` calls suggests attempts to leverage COM objects for system-level operations, potentially for downloading and executing a second-stage payload. The extracted artifacts, `macros.bas` and `vbaProject_00.bin`, are indicative of a macro-based downloader. The document excerpt confirms the execution of VBA code and the use of suspicious signals within the VBA code.

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` `b10a229f61f9088b28c515a7b829079f5a1bf556db0e6c8774f6fbca4792e96d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3379 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` `6eb6db2b6f340f148c88344daa9daabf386160e838016a2a7c800caee48c9d9d`	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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