Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 526364794d454f3f…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c89fb47f1d2d53845207ec27e2abe984 SHA-1: f217204cd88457f5d1563e1b8735d9f2e136a9c9 SHA-256: 526364794d454f3fc966fcf5aa748189b9a48680106b6c641675928e3f546dba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file is an OOXML document identified as malicious, containing VBA macros. Critical heuristics indicate references to PowerShell and cmd.exe within the VBA code, suggesting the macros are designed to execute external commands or scripts. The GetObject call further supports the possibility of object manipulation for malicious purposes. The VBA code itself appears to be obfuscated, but its primary function is likely to download and execute a second-stage 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
7cd8c4e9732fa60b67fcd7a1f73b79f020df572052982ecbfa9526e37a6879ac		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
bad1e2534467b94d90914a19a8e5dc7d73cbcc5a9c0662426806081787ee2c67		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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