Office (OOXML) malware analysis — malicious · 5bfdf99f25a8b795

MALICIOUS

Office (OOXML)

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

MD5: cd826927994cda3318812b7114a9e5f9 SHA-1: 980433b141780a58425a62b1a164f751c050c63c SHA-256: 5bfdf99f25a8b795ad8dbc51faf8fe5f77c52388f9eae3e70845722ef6538fc6

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. This suggests the macro is designed to execute a command-line tool, likely to download and execute a secondary payload. The VBA code itself appears to contain Base64 decoding logic, further supporting the idea of obfuscated malicious content.

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` `01e600bcd535c78e1107d2ad413fe652449a3104ce7602687640ffe47a10af8c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `a7a2785d24552cfefc75efa2cc86d480c5d96276ac7c787893c46f547a8c625e`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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