Office (OOXML) malware analysis — malicious · 83ae41b4ac5b3c2b

MALICIOUS

Office (OOXML)

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

MD5: d13d628b5ac48a535292dfe3f4798256 SHA-1: 7e59802b25e140f4342ec577144c11995b2c5875 SHA-256: 83ae41b4ac5b3c2bb88f844e970ba298d849f2e6a2e0341755a9797d8296c8b4

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample is an OOXML document containing VBA macros. Heuristics indicate the macros reference PowerShell and cmd.exe, and utilize GetObject. The VBA code appears to be obfuscated, but the presence of these references strongly suggests an intent to download and execute a secondary payload. The primary attack pattern is likely spearphishing attachment, leading to macro execution.

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` `2b1faa04a98d7775e17e31763df852cccf30a31b42ef429d9d030db6a7305fed`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `08ede9edc25314fc9595f32b6dc841fb8a74e3df49bb46bdd405fbdc702f8526`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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