Office (OOXML) / .XLSM malware analysis — malicious · 4402d0e401a0ab08

MALICIOUS

Office (OOXML) / .XLSM

306.9 KB

MD5: 2f0e056cd763c844b6d76561a1dc0c82 SHA-1: ad3b51ceca1630ee40a4149162984f8064192c53 SHA-256: 4402d0e401a0ab08ffaf843ceb18aae1ede56771a2e51bd7e21fedd26e005a46

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The critical heuristics indicate the presence of a Workbook_Open macro that utilizes Shell() and URLDownloadToFile. This strongly suggests the macro is designed to download and execute a second-stage payload from a remote source. The extracted artifact 'macros.bas' likely contains the malicious VBA code responsible for this behavior. No specific family could be identified, but the delivery mechanism is clear.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `5cc1813ce247635ebcd5becc48ebb49a323d4feddd7c71fe04dfd0231aa7c87d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3414 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` `d022d332c42e997f0ad471ccd7c490c4c36bfc0d267a8e4f01928bf5db17abb3`	vba-project	OOXML VBA project: xl/vbaProject.bin	6144 bytes

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