Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f8b61bb96a2d2485…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ff838c0940412be23d7e4e683f9394ff SHA-1: 3400a52c6059b2e937619856fb9dc00b5ad59b02 SHA-256: f8b61bb96a2d248599aae3217832d132f067df8dcb408cdea7e60553b88565f8
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The 'GetObject call' heuristic further suggests the macro is attempting to interact with external objects or processes. These combined findings strongly suggest the VBA code is designed to download and execute a second-stage payload, a common technique for initial access via spearphishing attachments.

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
4cb8f3b72b5807f7a7041e905a7cefa65ca07bde2b5c9a503829bfe57d77ab82		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
0de607766d78a64e86fe5740eb1b0659ea008208c554b1918cc4ccbea1028130		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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