Office (OOXML) malware analysis — malicious · fae9c6a0d1be59ae

MALICIOUS

Office (OOXML)

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

MD5: 806037d4fa3ef1a19587613b94f2110d SHA-1: 5332e88d05bb99df12c576ab9c8a1af687bbac42 SHA-256: fae9c6a0d1be59aefb392f4fda08287bb88bcbb846739f55767cbefa5cac4377

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 OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The Decode64 function is likely used to obfuscate a payload or URL. The primary function of the script appears to be downloading and executing a second-stage payload, which is a common technique for malware delivery.

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` `5025fd0b1b1f623aa25e2e9852c2e0eee2a762e3cf9c77274cb1ec1adf38278b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `ca1c20bd7af38a3bd204e20fd09823d4800e74541a072a6e151822996e39723e`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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