Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c84e9f7c085e6385…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2a5299c42ad0c174d3fcfd87a6e8be30 SHA-1: b8233b5ef3036b5e812d8ddd1f1b56646ff683bb SHA-256: c84e9f7c085e6385943547ab8859c2e34da4ccac32dffc85d4b3639ea5c5ec89
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The Excel document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code appears to be obfuscated, making it difficult to determine the exact payload, but the intent 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
671a1b0b9174785ce0f2515b433748a696bdeb71dc23eb79709790f5ba8385bc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
229621f2ff10e9996977bad9dc8e299163c7bcdddbbfe9576b97ad14bb6b4f01		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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