Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8f74abc6a877eb59…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 294793a221e5296edb84607a3df246e7 SHA-1: 7384d1f05e9c842e425cc18bc887fe01943f10fe SHA-256: 8f74abc6a877eb5950c0a41d5d598d3c6f2b1366173b92e99cbbd15f97b4b627
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 arbitrary code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload, possibly downloaded from a remote source.

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
e00bb700aebc9173de45f82430cb5b7d442c3763cb5bcef0ea74987a0eab5363		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
d65c0dee813dfe344ca2fa947099924850dddb61648794f0c4b2c42523cafa86		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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