Office (OOXML) malware analysis — malicious · 31604e0bc18c216e

MALICIOUS

Office (OOXML)

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

MD5: e2aa0affe79240becabdb7199014c3a8 SHA-1: e8073951832da27532d0e0a9faba91d27e1fd24f SHA-256: 31604e0bc18c216e4904ca60bac2eade3d811d2c5eecd3a9272929a92bc21602

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload, possibly 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` `5672f00fda63afc5e4f7d9b52c7b2d26cdf11aa7c57d775c129587ba6ac1e033`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `3bd0e765fe1917b349f320bfcec34ee3628a0d1ce29ac7e6bfc1c6f043e24992`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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