Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d0c6bec5228d425d…

MALICIOUS

Office (OOXML)

57.5 KB Created: 2021-08-03 16:26:48 UTC Authoring application: Microsoft Excel 16.0300
MD5: e80fffd3c3b314dabd9b10217c7f3970 SHA-1: e9ab381be1305129b78a5063af1087dbd56419b8 SHA-256: d0c6bec5228d425d9e548d3fd6e87ee0e1882258b622932489267750f569e854
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1559.001 Component Object Model Hijacking T1218.011 Signed Binary Proxy Execution: Rundll32

The sample is an Excel document containing VBA macros that utilize WScript.Shell and CreateObject to read a registry key related to Microsoft Edge. The script then appears to call a subroutine 'SelLoop' which is truncated, but the overall behavior suggests an attempt to gather system information or execute a secondary payload. The presence of WScript.Shell and Shell() calls strongly indicates malicious intent.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • External relationship medium OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink1.xml.rels: Selenium Updater 1.00 - Backup.xlsm
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6906f7379bfaef5e5bf6073f9db61338f3856d0c196ba07cd6519997a3182740		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3878 bytes
vbaProject_00.bin
1f4247648649dae67fb98e29f57c21450ecb32718ae6557d5717bd0d141f3ebf		 vba-project OOXML VBA project: xl/vbaProject.bin 36864 bytes

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