Office (OOXML) malware analysis — malicious · 932a57a8ccda948f

MALICIOUS

Office (OOXML)

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

MD5: f7d0eea1ba408f3f197248ec5edfd9a8 SHA-1: 6a88bacb9c17aaf7d0f8e5793902cb2788160070 SHA-256: 932a57a8ccda948f0d2ec71b7ac2816afb64a262114f6702e95e73def1217a63

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 file is an Excel document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code appears to be a Base64 decoder, suggesting it's used to obfuscate and execute a malicious payload. The likely intent is to download and execute a second-stage payload via 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` `34acdf1ce178d388472c59d1616861b3dc1923fb80a7d85e419b09553bc5fcb5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `8ac4f0121f630cf148c9b70c2a5b8bf6e8e0bac85eeaf5c6d2de7917ba9a9a58`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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