Office (OOXML) malware analysis — malicious · 872f54dd4be8d407

MALICIOUS

Office (OOXML)

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

MD5: 776f49d3832cc9fd52d985bd8f16e9dd SHA-1: c327f9e1cdbeda9399c38b5ffff46f3e2987ac1c SHA-256: 872f54dd4be8d4074c0f5e9f82d1cf345a164d24c8bc961e86c62dfdfe93acdc

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an OOXML document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute arbitrary commands. The VBA code itself appears to be obfuscated, but the presence of these references strongly implies a downloader or dropper functionality. The primary attack vector is likely spearphishing attachment.

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` `dd8389b014c8ee5dc6e1fe9790130bd089bc22d5e5bcf247b5b637ddc89c42a7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `5722a2f8755dd5587227ec94c99eb4f66ef208fbbd9dd6318d5f16d9a8834cb9`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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