Office (OOXML) malware analysis — malicious · aff25e275cc823f5

MALICIOUS

Office (OOXML)

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

MD5: 8fc7ecaa4b99c91d1708188ebcda17b1 SHA-1: ec6b632fb577e24270d7a427eb3e5c0439de9f3d SHA-256: aff25e275cc823f55cba99db8a51d2617761f0193e0fcd450b35a7b76f3d670c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

This OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a VBA project strongly suggest malicious intent. The VBA code appears to be obfuscated, but its likely purpose is to download and execute a second-stage payload using PowerShell.

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` `68187273f64a81605109d87296c97e05963c4c50166ac4899cfafcc54f086857`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `3f8bc75f9f0f803532bec3c97608d9ef140791ec1dd453c0946b08f4b3ca0990`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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