Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1db2a76f1802e07d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:44 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 72692ab0166248eb92b4829d843676c2 SHA-1: 83e5f027f9ad2e1767cca6c43d943006b3de90d1 SHA-256: 1db2a76f1802e07d04b858743fb51f1c62508e1129599b1a0606decfd5c8de88
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique allows for the automatic execution of code when the workbook is opened, likely to download and execute a secondary payload. The presence of dangerous formula APIs further supports this assessment.

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) 6658 bytes
SHA-256: 04c45d9023c7e200293fa3550fec796503386261968cce8c43dc93864523fd39
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  scXITf
' 0018     23 LABEL : Cell Value, String Constant - aaSUMZnz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A148 
' 0018     20 LABEL : Cell Value, String Constant - CofCn len=0 
' 0018     22 LABEL : Cell Value, String Constant - CRlaRwR len=0 
' 0018     25 LABEL : Cell Value, String Constant - EpuHXHXuWl len=0 
' 0018     20 LABEL : Cell Value, String Constant - hocJB len=0 
' 0018     22 LABEL : Cell Value, String Constant - IogNbLZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - KHwWfDqQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - kHyGIETQDvB len=0 
' 0018     21 LABEL : Cell Value, String Constant - KUaZSM len=0 
' 0018     25 LABEL : Cell Value, String Constant - kuqMVRzPKP len=0 
' 0018     20 LABEL : Cell Value, String Constant - MaUXa len=0 
' 0018     22 LABEL : Cell Value, String Constant - MJHVtlp len=0 
' 0018     24 LABEL : Cell Value, String Constant - ndsDvdVEF len=0 
' 0018     26 LABEL : Cell Value, String Constant - QNwwIgAeQis len=0 
' 0018     22 LABEL : Cell Value, String Constant - rEfhQEI len=0 
' 0018     20 LABEL : Cell Value, String Constant - SJjAL len=0 
' 0018     24 LABEL : Cell Value, String Constant - TOTosoJpO len=0 
' 0018     27 LABEL : Cell Value, String Constant - vcqsVLODLRlv len=0 
' 0018     26 LABEL : Cell Value, String Constant - WOdsZRPVdIR len=0 
' 0018     26 LABEL : Cell Value, String Constant - YmAtwbitvUS 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 LA
... (truncated)

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