Office (OOXML) malware analysis — malicious · 874612983ae79d48

MALICIOUS

Office (OOXML)

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

MD5: 9efa99f82edee53ba80ba7b98a67d048 SHA-1: 9bf940580131301fa673dd6a5ef93535fea4ac20 SHA-256: 874612983ae79d4824e5845185e5133ac39cbbe57599e79cd77dcb10a3018570

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's used to obfuscate a payload that is likely executed via PowerShell or cmd.exe. The primary function of the script is to decode and execute a payload, which is a common technique for downloading and running second-stage malware.

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` `8d081ecc6ea070a00a45ab5874322ecfbfc8c8fe33fb9ee856e627e9cf7340ee`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `13b67d22308071d8ca551b932a7b9dcfdf6ef492e78dd969dc992ea47be90af0`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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