Office (OOXML) malware analysis — malicious · 77fc323e002e54fa

MALICIOUS

Office (OOXML)

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

MD5: a75f29f400e81d45fcb721ffeb0df1d6 SHA-1: 6123ea9c3014a97c6cd9353d40b789b19ced360d SHA-256: 77fc323e002e54fa818266d9ce0bb650f8cad456a5ac6bff9e1128715dc7d3c9

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros strongly suggest an attempt to execute malicious code. The VBA script itself appears to be heavily obfuscated, but its references to PowerShell and cmd.exe indicate a likely intent to download and execute 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` `e21382ee39441e2600adaced3da2174367a2b7b3291431a700efbc822540ff69`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `9f4cba829b869d50ff59ec44763bfb94a802a891f377bba6f6360336aad253d8`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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