Office (OOXML) malware analysis — malicious · 2b970b63e2022d2f

MALICIOUS

Office (OOXML)

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

MD5: df0db2398539c95584c75e26ca5a9f88 SHA-1: 20055ad2b3d2428c667b953616a8951c4582b83a SHA-256: 2b970b63e2022d2f001467ad9281c2f5a9f295b68756f00e82e4bc7267d16a51

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Office document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it attempts to execute commands. The presence of a GetObject call further supports the possibility of downloading and executing additional payloads. The VBA code itself appears to contain Base64 decoding logic, likely used to obfuscate malicious commands or URLs.

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` `11d0076f1b1284242592a322364bae9b3a66a012e4b89827140fcba0f4965695`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `2913bce2e7336177d1feb56ffff613c43b58c488298fd3705209ea3f2f388fbd`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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