Office (OOXML) malware analysis — malicious · 65e69d3789ab9138

MALICIOUS

Office (OOXML)

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

MD5: fa21a6f21ed4111122219dcd45de2405 SHA-1: 63a9a03a713265e23b64e4a86d826c6ffe2599ce SHA-256: 65e69d3789ab9138f39bf4b9539e40b0a2eeedaf15dc9da3a612b3fa70339277

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call suggests an attempt to instantiate and run an object, likely to facilitate the execution of a malicious payload. The VBA code also contains Base64 decoding logic, which is commonly used to obfuscate malicious commands or payloads. The primary function of this macro appears to be downloading and executing a second-stage payload, indicated by the PowerShell and cmd.exe references.

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` `d349244257f95da7c4d7064680cee228a0ce5fbe0b9ae842e97c191a55f6ffb6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	34430 bytes
`vbaProject_00.bin` `0ab333e644b2cbdba4535841f0c1505738bd3fbb37ceee61e6685e6e6acf8165`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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