Office (OOXML) malware analysis — malicious · 20abeed5a320c1fa

MALICIOUS

Office (OOXML)

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

MD5: 25e41db9910691e5844df22116eb4ecc SHA-1: 76dfa89726c58b5328dc8b30c13d5aab3bccf7fa SHA-256: 20abeed5a320c1fa1d2a1bf417e2325808bfb663f41e2ccc63a90016300e80c8

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

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 obfuscated Base64 decoding logic, suggesting it is designed to execute a downloaded payload. The specific obfuscation and lack of clear indicators prevent definitive family attribution.

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` `3d54a14d10a4416ae4d28b57665d0694743ae463ee39ab85b1814833788500e8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `dc87ad36ae5bda8d8d8ac69afc698e1ddb9480e58a8209aba3026946937be833`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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