Office (OOXML) malware analysis — malicious · f1deadebb774d2d5

MALICIOUS

Office (OOXML)

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

MD5: 05c7b0f4c4d780aa7df8a48c478fd4bb SHA-1: 2984edf81b8efb6578bf027586472322824e8e5a SHA-256: f1deadebb774d2d5f45b2c719ff485931ac3d6fcc4185af9f03de270250cd895

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The script's functionality appears to involve Base64 decoding, which is often used to obfuscate malicious payloads. The primary function of the script is likely to download and execute a second-stage payload, but the specific URL or payload is not directly visible in the provided evidence.

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` `070dba12bc36141a08c03db0ecf260dcfd222d4e9d38df0db3f861e355ff560e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `924640c2dde141f4bf03a12ad4e527510050a3bfeba1f7b9f48ab8dbdb535d6f`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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