Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b6297d1776a43e56…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0ba3dcdfbb4110fab5c03ca45d52e91a SHA-1: 7477768d99d130e8dc26e42a03dc37b0db942f51 SHA-256: b6297d1776a43e56a7bff839f14d89ed3f2d5def645b16b84937f859cdf14622
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The presence of a GetObject call further suggests dynamic execution. The VBA code appears to be obfuscated, but the references indicate an intent to execute external commands, likely for downloading and running a second-stage payload. The file's nature as an Office document strongly suggests it was delivered as a spearphishing attachment.

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
cbe29cf9be71ffdbfe53ace30f3b1b4dd1f9b6416970f33a5e466e3024a78688		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
e764fcf15548aa8895675180be9f5e8bb73d413181b673416847630922637255		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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