Office (OOXML) malware analysis — malicious · 2ce44df15356a9f3

MALICIOUS

Office (OOXML)

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

MD5: d88b4d69cc6e75c58f73ee807d057b9f SHA-1: 77cbf6d02fbf8ed948f2e9398689f4a5cc805c92 SHA-256: 2ce44df15356a9f347da4deea89c84d1c3fdca276bafca040c488f6db97e305d

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute commands. The GetObject call is also suspicious. The VBA code appears to be obfuscated, but its likely intent is to download and execute a second-stage payload, which is a common tactic for initial compromise via spearphishing attachments.

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` `d3588cf7f48801dde8fe3002e535cda3ceeb99c3580641f9042291f507386d12`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `84f2ab5117ddcc344eb279225e9e340c888e103f2ebed1a6c9dd91d363a38a77`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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