Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2047ee8b361a3d1c…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:44:49 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: f385b2e21efb245098e30c05b9e3a3f6 SHA-1: 1a6aebdd652adaa83b39b5f507df77dbf8247782 SHA-256: 2047ee8b361a3d1ce96d293e0abeccfc1e340a90bc69434ce6095ef165a6c771
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common technique for executing malicious code. The `RUN=0` value associated with a dangerous formula API suggests the macro is designed to run an external command or payload. No specific family could be identified, and no URLs or other IOCs were extracted from the document body or scripts.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6553 bytes
SHA-256: 6dddd2be6e2809061340e4c4f60ba05d98179e29355746b752a3bfd850740581
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EVZkCVJmId
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H151 
' 0018     22 LABEL : Cell Value, String Constant - diJCNWv len=0 
' 0018     23 LABEL : Cell Value, String Constant - DlBQZKEB len=0 
' 0018     21 LABEL : Cell Value, String Constant - EbNeuv len=0 
' 0018     24 LABEL : Cell Value, String Constant - egGWewWJo len=0 
' 0018     24 LABEL : Cell Value, String Constant - eHsoUodzu len=0 
' 0018     22 LABEL : Cell Value, String Constant - FONIXdz len=0 
' 0018     27 LABEL : Cell Value, String Constant - heZlYqWkzLjA len=0 
' 0018     20 LABEL : Cell Value, String Constant - iwPRO len=0 
' 0018     21 LABEL : Cell Value, String Constant - nvIcoB len=0 
' 0018     23 LABEL : Cell Value, String Constant - pluaqXXi len=0 
' 0018     22 LABEL : Cell Value, String Constant - QGThbsC len=0 
' 0018     20 LABEL : Cell Value, String Constant - qScOy len=0 
' 0018     26 LABEL : Cell Value, String Constant - rfpvINIkPvb len=0 
' 0018     20 LABEL : Cell Value, String Constant - rnBwd len=0 
' 0018     21 LABEL : Cell Value, String Constant - sIWNWd len=0 
' 0018     22 LABEL : Cell Value, String Constant - SrPehhi len=0 
' 0018     20 LABEL : Cell Value, String Constant - TvuYb len=0 
' 0018     20 LABEL : Cell Value, String Constant - UsRzs len=0 
' 0018     27 LABEL : Cell Value, String Constant - WotEwDPpVqGU len=0 
' 0018     22 LABEL : Cell Value, String Constant - xPBUtmw len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell
... (truncated)

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