Office (OOXML) malware analysis — malicious · 83411437d5b1cec2

MALICIOUS

Office (OOXML)

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

MD5: 9496b4ba6e0986ac4c93b864c36851d6 SHA-1: f3251dec2c90f5c00ab195b4be8d2c8df2f86d4f SHA-256: 83411437d5b1cec277593e832976da7b65ad6fc3ccd19651f92c43d207437729

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 a GetObject call. The VBA macro itself appears to be heavily obfuscated, but its likely purpose is to execute further commands, potentially downloading and running a second-stage payload. The presence of these indicators strongly suggests a malicious macro 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` `18a63cc23e43e3f01723a25bae92270412a6707bf41c833811bdfff5779e66f8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `7deb79ca83c21f008505d5e837cadb563c335100c07a35f63ccffded8932889e`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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