Office (OOXML) malware analysis — malicious · b4a5dfa8f8975845

MALICIOUS

Office (OOXML)

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

MD5: 06b086a1f423cd0d070c02ff9c37318a SHA-1: 9b07446315053da52758d6f0387ed27bc8f963d3 SHA-256: b4a5dfa8f8975845a5e92216f139997ce0e2757dc74a6f01d0e13d051b0212d7

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 contains a Base64 decoding function, suggesting it's used to deobfuscate and execute a malicious payload. The primary purpose appears to be downloading and executing a second-stage 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` `e54996b0cbfbacf7ba8b426cb0dd5bee4b3f0294c2ebcc2d42ab07de1f3b3f33`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `4dfd0b9c53b52dd7cee5a7b722e9c4b5b724363732e595c107c5dde38a161b2d`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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