Office (OOXML) malware analysis — malicious · a75a5ff9014b3eb1

MALICIOUS

Office (OOXML)

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

MD5: 74be94fb7ce8c8d2697592b72c67ce70 SHA-1: 293a11dbf256c7fc6854cdb7b06cb44ef10cf206 SHA-256: a75a5ff9014b3eb1734b46e4cffb0cc75ef446067584c35f089ac29b0d7e7b22

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. The VBA code itself appears to be heavily obfuscated, but its structure suggests it's designed to decode and execute commands, likely a second-stage payload. The presence of these indicators strongly suggests a malicious macro-based downloader.

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` `6d4bc02ca16c1dfc0435e57810681d654fb9780c31bc0f6249951fb6a9774e7c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `d42b0939748cff365db0a3301e2dba259339a67c9b091434df40ee2badebd2a5`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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