Office (OOXML) malware analysis — malicious · 3d4b5d247dda83a2

MALICIOUS

Office (OOXML)

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

MD5: f555933cfddeb28573f4022a5e4d8f49 SHA-1: 244fdd3beaffe7d6d93ed945e51985a85d939997 SHA-256: 3d4b5d247dda83a2d5420723465c06fcfee66b40bfaf3158c7eefa286359dde3

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. The VBA code appears to be a Base64 decoder, suggesting it decodes and executes a payload. This is a common pattern for macro-based malware downloaders.

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` `eeee512aaad65833555b49a1dc920182ef43b53464d8a218aff2cca826421a0d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `1192b103f2c1d46dd99e6968c008336b7a8907ce1dc0e873139c0d309cd997ed`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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