Office (OOXML) malware analysis — malicious · 90e4a3b72bef01db

MALICIOUS

Office (OOXML)

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

MD5: 8670463023e8f9f702da197a7b7402da SHA-1: 65a5c3a5b15922ea3be79f3f4635e4d9d9326319 SHA-256: 90e4a3b72bef01dbbbf2bf62539ef2b2a90c114034f2d5444a3a7945885d5876

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic 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 arbitrary commands. The presence of a Base64 decoding function within the VBA macro indicates obfuscation, likely to hide a payload download or execution routine. The primary goal appears to be the execution of a second-stage payload 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` `5268a7ed439aad8453d4853f4cb27c15a65a5190fd24d5ff0de9b00775e1be6b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `4805d2d752e62a3e78b1d665878d60b1539d7e738750d1dedf6830ad96023bbe`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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