Office (OOXML) malware analysis — malicious · 1ef507d76817ac3f

MALICIOUS

Office (OOXML)

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

MD5: d76088a594a3a31d21fa0866a263bca7 SHA-1: 02217aeb856e5fbd0e8b6e77616e1d096ebb7bf4 SHA-256: 1ef507d76817ac3f2be30a4b25ade06e0e5cf699efacbe25ce840ed6c6ba88b6

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 code itself is heavily obfuscated, but appears to be designed to execute a PowerShell command. This suggests the document is a macro-based downloader intended to fetch and execute a secondary 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` `5bb3f5f9090e89845801e373ebc155b8819f3f7ab93ede62bdee2a73468db1e2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `6ee9e6417fb6413cae92f2ac1ccdcd06dfb386f5a65dab27b02ceecd3394462b`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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