Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b6456f195dcd7590…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9fe8c35e0ce1762521d2e5b799e9a7d5 SHA-1: cb159353addaed9b577c7adf80d17a904670fb5f SHA-256: b6456f195dcd7590c3828eaa42095ff17c0d81ae2bfa978a23e7481c7d11bc2e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of obfuscated VBA code suggest an attempt to download and execute a second-stage payload. The specific obfuscation and lack of clear indicators prevent definitive family attribution.

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
13faf70dfd53c467bdca9fb52c4fec200f23283aa795635ddf4083ad57451803		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
53c5a5aa82d9462893d81c375e2d2a09997bf46be777ca9e77cfe946bf59003b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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