Office (OOXML) malware analysis — malicious · b3563afa7d8d1441

MALICIOUS

Office (OOXML)

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

MD5: a23185a4da5983214150ef2211b0b09d SHA-1: f93da61b01629c88e66b040c434ad6e120cb313b SHA-256: b3563afa7d8d14412cf3ed5f3b2168d2d8537e7a1022645a9b0c982854df4cef

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. The VBA macro itself appears to be a Base64 decoder, suggesting it's used to obfuscate a payload that is likely executed via PowerShell or cmd.exe. The primary purpose is to download and execute a secondary payload.

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` `0e3c16ba47833be2e2afeec1bdfaec28e45e9f1d4a39278d8fb4b2920cb19896`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `dad49ee664a6869549ba8378759c8237ce9a28c746acf06702d0f376d9857b69`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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