Office (OOXML) malware analysis — malicious · 18fa7ebc87dac24c

MALICIOUS

Office (OOXML)

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

MD5: b3393df94cf3217b8edfb4af9dd82595 SHA-1: 019a989084ab5ed488bd55cd75c4a20a212b863c SHA-256: 18fa7ebc87dac24cdaa0412aa47646ddbb38ab1116e45381ba6198ce3a6a4e64

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 OOXML document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The presence of a Base64 decoding function within the VBA macro further supports the idea that it may be decoding and executing a malicious payload. The primary goal appears to be the execution of a second-stage payload via scripting interpreters.

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` `90f40e01cefbf2181c372d85139734d056873dce094b1a39cd62e72bb0c68c72`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `67ecf294496ee158c090d340693fea9523e9295a8fba3b4455caa8f5da0c22e5`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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