Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 445c25682b72966c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9ad5af9508fcb5c49729301422d9cc50 SHA-1: 875c4d048f763245bbc173320fb04e388f77cb24 SHA-256: 445c25682b72966ca7c94411da6231a422796405c5edc5a82998f6a732fc5364
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 PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The GetObject call further suggests the potential for object manipulation or execution of external code. While the VBA code is heavily obfuscated, its presence and the referenced commands strongly suggest a downloader or initial execution stage for a malicious payload.

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.

FilenameKindSourceSize
macros.bas
224bdffb5a7c6cbb07f07bfa3b054910f58f2dadc8c186638161b664112910c8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
53ec6b9e8234b9c08c1187c0413bf0f6adcfeaedfb768dbd12da1bab67bc39b1		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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