Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 37ee195de3b7bc59…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:19 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: 2cc3de82427b4c77d600da4573ed6960 SHA-1: 9ef69091a97456281ac739606673602971fe7551 SHA-256: 37ee195de3b7bc594eb67bc69035d98cddc82dbae5024f588e5ce15fb3214230
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a critical finding. This indicates the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a secondary payload, a common technique for malware delivery.

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) 6989 bytes
SHA-256: 71f549873914e8dbb20fc3b82c80cd90b0d4cc033b4109a7f99ec6ddd77647c7
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 -  tlkXSELuCx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D168 
' 0018     21 LABEL : Cell Value, String Constant - DWfGSD len=0 
' 0018     22 LABEL : Cell Value, String Constant - DYOkbmV len=0 
' 0018     27 LABEL : Cell Value, String Constant - EkviZCNNDMwL len=0 
' 0018     23 LABEL : Cell Value, String Constant - eLkZBDVz len=0 
' 0018     27 LABEL : Cell Value, String Constant - HEDaXlRuVVnr len=0 
' 0018     25 LABEL : Cell Value, String Constant - HGHAuGtQoD len=0 
' 0018     25 LABEL : Cell Value, String Constant - HHoxUJIZZJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - Jlkbeyzs len=0 
' 0018     25 LABEL : Cell Value, String Constant - LbDRqioPdN len=0 
' 0018     20 LABEL : Cell Value, String Constant - lBIKA len=0 
' 0018     25 LABEL : Cell Value, String Constant - lkJxfNCJld len=0 
' 0018     26 LABEL : Cell Value, String Constant - nkOBCUJtwIG len=0 
' 0018     27 LABEL : Cell Value, String Constant - oZUbbTmgPHcu len=0 
' 0018     27 LABEL : Cell Value, String Constant - PqZoZCuIivqh len=0 
' 0018     27 LABEL : Cell Value, String Constant - QToCvZXqYEHM len=0 
' 0018     21 LABEL : Cell Value, String Constant - rfWKGm len=0 
' 0018     27 LABEL : Cell Value, String Constant - TafTAWMwTZeV len=0 
' 0018     24 LABEL : Cell Value, String Constant - uzMlgCkuT len=0 
' 0018     25 LABEL : Cell Value, String Constant - vthhvDqQFs len=0 
' 0018     22 LABEL : Cell Value, String Constant - vWVlcdM 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 C
... (truncated)

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