Office (OOXML) malware analysis — malicious · 2cde76c8207b72b1

MALICIOUS

Office (OOXML)

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

MD5: e24df2f8cb318c63d90387bb3b3a123d SHA-1: a94b04e9b269d944e325c30b1f2fafb53c0c0fc2 SHA-256: 2cde76c8207b72b128c67b23a7379d7ceacb8f8bb8b303642cccae412489bb22

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 OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute arbitrary commands. The VBA macro itself appears to be heavily obfuscated, but its presence and the associated heuristics strongly suggest it's a downloader for a second-stage payload.

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` `3f8512a5ae52aeb8c5132d2aa8242a9eb4e3173c9e458159aa46d096411f1509`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `457d0a7803285c3f4eff67bd4f787f0844c03037b1a1affedfe9c812583297d2`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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