Office (OOXML) malware analysis — malicious · 0385186f17e56c86

MALICIOUS

Office (OOXML)

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

MD5: a6af334a4d2c3cd3d00b577bae6b7cbe SHA-1: b2ecd8671dfa64def1ba87d286028d887b366074 SHA-256: 0385186f17e56c86c377612d5ebc467069e16ebfd28987ec25d6aba4da74b592

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, suggesting it's designed to execute external commands. The VBA code itself appears to be heavily obfuscated, but its structure and the presence of these indicators strongly suggest it's a downloader for a second-stage payload.

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` `ed17e06247e235a85c50e65af5e6452cf44d15ad0252ca38489cb5d1dd73e273`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `03d75202a8a597b580f97155e73ee07487d983deac4052fda9ad9c6cbc909947`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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