Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d6834745a90b085e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d3701d9cc1e7d682701e31d23171423d SHA-1: b43fddf277b33c3860af03d6bc868482ec9f997b SHA-256: d6834745a90b085e5a5d1cfbce7b89d9dddbfef093613865220056a5f67db299
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 commands. The GetObject call further suggests the potential for object manipulation or execution of external code. The primary function of the VBA script appears to be decoding and executing a Base64 encoded string, which is likely a secondary 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
58af5a6e80cf6551626641e5a77e115bb1789764652fba31bbdee23736339992		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
dd7ee12ace429fe4fd0de4dc4334035a11be5f16db478a62dd11ac5307c96023		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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