Office (OOXML) malware analysis — malicious · d747033115a12a15

MALICIOUS

Office (OOXML)

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

MD5: 37db2cf06a1e32051e742ec6ec2fbc18 SHA-1: a78b02132dc879426ced16194fb6b63d313894f6 SHA-256: d747033115a12a157797f8057e871195eccfe08bba1e87c1d2ae0874281a8cf0

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 cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The presence of a Base64 decoding function within the VBA code implies that malicious content is likely encoded and then executed, potentially to download 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` `e3708bff10d39157bf9bc3d5ef56f45766578220258963852d4a18bae3bf718e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `7e926d6de92000faeb79b6b4657ef18e603e81de7e682d5fbc62f2ea71b173ed`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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