Office (OOXML) malware analysis — malicious · 34e08d5a8f5f80fe

MALICIOUS

Office (OOXML)

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

MD5: a91b1295b06712a69db2cacb126f000d SHA-1: 42bc0ee98f36c2ec1ef96550859a11f9edc1d9fc SHA-256: 34e08d5a8f5f80fed84f1a47fd84d6a05bb0b063b50846ba199fddbccb27ac08

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing VBA macros. 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 heavily obfuscated, but the presence of these references strongly implies a downloader or dropper functionality. The primary attack vector is likely spearphishing attachment.

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` `b90c979feb45d322eac2e073dae284677943d7051fe1d270a13833655113faaa`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `661fecd9c7ca6ca4777ffc58c6880c80b5a555db845bf1c08efb8b95cf9ce6c4`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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