Office (OOXML) malware analysis — malicious · c0f98d081a5e444f

MALICIOUS

Office (OOXML)

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

MD5: 794ebab76b18614bb0292d9003f2a0ef SHA-1: fb371dc1a4d8e38175f003f710c562c92be6a5c9 SHA-256: c0f98d081a5e444fd4b178c1c4eccf3d6221a22a4c75b88dc3f1674ab3538f58

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it attempts to execute external commands. The presence of a Base64 decoding function within the VBA macro further supports the hypothesis that it is designed to download and execute a secondary payload, likely via PowerShell.

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` `b8f95f5d92918ae7b9e2f444e114299e05003cf250660827866b134032ad7cf7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `da9e28ddbfffb838aec391492f98e9cf1fb27de021d652c90af560537b2223db`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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