Office (OOXML) malware analysis — malicious · f3ef1846713c9e86

MALICIOUS

Office (OOXML)

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

MD5: 681fd35787439d4e7571510ce6c80ec3 SHA-1: 7af117610d494559426e0309ecb2dcd5fd601f72 SHA-256: f3ef1846713c9e860453476e70d2214530cf4c71f6941fbd851749c3aa3ba2d3

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 heavily obfuscated, but its likely purpose is to execute a secondary payload via PowerShell. This suggests a downloader or droppper functionality.

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` `dd1bb71ac05cbe377867f3e541d8cacc59bcb21922e3bc90ae594829dbe082d5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `7078d5adaa2fbe650db08075c4b3f26bb182b0274a211170045b7e1fc99e3d21`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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