Office (OOXML) malware analysis — malicious · c769317a57947a44

MALICIOUS

Office (OOXML)

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

MD5: a667bc4ca1c7cf8368ef479955efa82f SHA-1: 1ed724d8527ccf0de31a6c5bc438eb05928df749 SHA-256: c769317a57947a4410616e4352917423bcf7014c6595c78817cc2a4e09579b73

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be a Base64 decoder, suggesting it is used to obfuscate and execute a payload. The primary function of the script is to decode and execute a secondary payload, likely downloaded from a remote source.

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` `0d69cfcc81562549b0043d4cecbabfe36a14d4250891e4b2e999a11ae8e26a6b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `1762ac9048ea79c07ae1c0817bd4fd7a0c1a65614968377d137c33bfb7b2e7f3`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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