Office (OOXML) malware analysis — malicious · 1d5396558ff060ff

MALICIOUS

Office (OOXML)

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

MD5: f7a27b49c56ddb207956f2182691f3ca SHA-1: e21d004b971523d4d9f4a62ffef17ece2e57e56c SHA-256: 1d5396558ff060ff65fb2750744a071988670e3f80c088efa8a0b2fdd4e40af9

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Office document containing VBA macros. Heuristics indicate references to cmd.exe and PowerShell within the VBA code, along with a GetObject call. This strongly suggests the macro is designed to execute arbitrary commands or download and run further malicious payloads. The Base64 decoding function present in the script further supports the idea of obfuscated malicious code execution.

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` `b2d3ad1129c1513913b488c1902bace194f85a40bdd2b7898547a45cbeecfb30`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `11102272a3fa317179a65a11bf134c08f0d8bc532fc7c61c7d72f3acdc6c5f01`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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