Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 de09fa22015d7aa0…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 76bcac7536de2591cc2d86cb80e9a71c SHA-1: c42d98639bc657e6a8a88e9349478456347edf1f SHA-256: de09fa22015d7aa04e7acc89ad286dcc48a2527c0081ead5ba48f190d2580905
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, along with a GetObject call. The VBA macro itself appears to be heavily obfuscated, but its likely purpose is to execute further commands, potentially downloading and running 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
c1c9c019c284f70f3607106faf1e2efc34c0b7de75adb63b40abe26b99f3b0da		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
33fa429d6b3e864c6fae37cb929a0028fca51abb65c577875f2316a5e50790f6		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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