Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 19948416c7a26dd3…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 57e7b3646ab1989e98fb6d278423ae7f SHA-1: 8e3c719040210502f1edc61401bf73bb6b8d2970 SHA-256: 19948416c7a26dd3c79f2db0ef20107dde6ce88a5993496ee9483c5f00e583dc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The presence of a Base64 decoding function within the VBA code further supports the hypothesis that it decodes and executes 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
4e3d5ae231139dcca02f98a91a314a8169c15dd04499c1bf1ccce307c73ce87d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
fb673bcb8c897644f0ce2c823fa6c7a92f7d898095859e9985beb672adf09e73		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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