Office (OOXML) malware analysis — malicious · 7ebca73881c0fb27

MALICIOUS

Office (OOXML)

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

MD5: ded5d64f7d282ef8991a457e6e0feec0 SHA-1: e94029a418dcff2bb0ae40538f7307bfb1d88e2d SHA-256: 7ebca73881c0fb27940eeefc26fefc992f054adae277a55be438ef8e67b0fd90

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic 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 script itself appears to be heavily obfuscated, but its structure suggests it is designed to decode and execute further commands, likely downloading a second-stage payload. The presence of these elements strongly suggests a macro-based malware delivery mechanism.

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` `dc673f04305651e277b6fa4e60d977c8c92636357f869543ce1503fc2cb1e53d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `c4dc99f6ef03892fad5bc8920521d68d10b6dd769c25305bfc071a3b8094aac0`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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