Office (OOXML) malware analysis — malicious · a432e7bc5fad4989

MALICIOUS

Office (OOXML)

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

MD5: dca4b04a0664ad6f83fc7e2e33cbf8f7 SHA-1: c3bbd097b6f4cae30e2211cde6e01483c4f6c628 SHA-256: a432e7bc5fad4989f24d950ed2c3b9ed44661a0147bb291e5131b87361dde626

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Office document containing VBA macros. Critical and high severity heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute arbitrary commands. The VBA code itself appears to be obfuscated, including a Base64 decoding function, which is commonly used to hide malicious payloads. The likely intent is to download and execute 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` `02d8338c81c3e6392cd71d36f87e353a567554c6b95acb2791deb01348b6ac9c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `25b302ebcb72e323fc0c6d55e02904961cc7e6283d57e62f941fc707aa34cb83`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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