Office (OOXML) malware analysis — malicious · 8922b431ee8f9705

MALICIOUS

Office (OOXML)

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

MD5: 8fa0816d5a6a9334bb3f580be34b854f SHA-1: 82802d6d62ff1ccfbc975e847f2cf8fa88833e43 SHA-256: 8922b431ee8f97053a293e5c08c2a5572ddc108990413509f9bd30d90f709f57

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 document contains VBA macros that reference cmd.exe and PowerShell. The presence of a GetObject call further suggests an attempt to execute external code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload from obfuscated data or an external source. The primary function of this macro is to facilitate the execution of 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` `88441988b93adfe6fc9b5efe4f049cf8f6fa0d99fae8b86add8eab512662fb03`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `18149ef10f9b689a03056752c2cd865424363411cc0f3b322fedc058cf169fa2`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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