Office (OOXML) malware analysis — malicious · f520b3754fc57c18

MALICIOUS

Office (OOXML)

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

MD5: 6190de89b4660cf02dad6afc8c7132cd SHA-1: b32e1598dfb56021cec38d5ce47ffaf276a471fe SHA-256: f520b3754fc57c18eb4ecd5b423828eb40449f47a8fc9045e4ad15001d3c7f1a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest the macro is designed to download and execute a second-stage payload. The obfuscated nature of the VBA code and the use of these execution methods indicate a malicious intent.

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` `67906db868d73b61de09ffcf6febfec9311b4d4b19cbc71acfd0be5aa3d16314`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `d7478c3162a5e0b1347be82ece47dd4c48c3bd9e9d00e024e0481dd230427da8`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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