Office (OOXML) malware analysis — malicious · a1518b6c3090c7e9

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: 3ff9f348036ab46556ebbedf0eb89fd6 SHA-1: c67368af25743c8a9286bb52c13353d6e4ce5e3d SHA-256: a1518b6c3090c7e932a700fe56501e3a8c5ad7f512b7f2064d04e56f4441a591

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an Office document containing VBA macros. Heuristics indicate the presence of VBA macros, a reference to PowerShell, and calls to GetObject and cmd.exe. The VBA code itself appears to be heavily obfuscated, but the presence of these indicators strongly suggests it's designed to download and execute a second-stage payload. The obfuscated nature of the VBA and lack of clear URLs or commands prevent a higher confidence score or specific family attribution.

Heuristics 4

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `0b776e6592adbe0d36f9b66862e5b80db4c746af8dcee31bef7ae1872072b3c8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `46c9c9753578a9b454da0cf4a5b49960f672b0f8a649d4db0ae4315f320a8081`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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