Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 97912aaba15b7c32…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:48 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 804d9322804ef80a3710302a4cb5494a SHA-1: 8b7ecee560656f1d15da83d1161033aedc2d8c46 SHA-256: 97912aaba15b7c32a207b15a5639b848302eea27d82f1e5a0c38ad6dba680151
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 sheet containing an Auto_Open function, which is a critical indicator of malicious intent. This function is designed to execute automatically when the workbook is opened, and the presence of dangerous formula APIs like 'RUN' suggests it's intended to download and execute a secondary payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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) 6362 bytes
SHA-256: d067527585fd46f012ff90033cc6202d1214ff5ff9efc3d12c568b0f0470619f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EHz
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C152 
' 0018     23 LABEL : Cell Value, String Constant - DHWpQBxH len=0 
' 0018     24 LABEL : Cell Value, String Constant - frKgEuyga len=0 
' 0018     24 LABEL : Cell Value, String Constant - jDTveACwb len=0 
' 0018     23 LABEL : Cell Value, String Constant - JiVdNRHD len=0 
' 0018     21 LABEL : Cell Value, String Constant - LCfuUl len=0 
' 0018     23 LABEL : Cell Value, String Constant - lIEjgzzv len=0 
' 0018     25 LABEL : Cell Value, String Constant - mMuHFjGnmP len=0 
' 0018     20 LABEL : Cell Value, String Constant - MuxqY len=0 
' 0018     22 LABEL : Cell Value, String Constant - nLdBcmX len=0 
' 0018     22 LABEL : Cell Value, String Constant - OcLPMSa len=0 
' 0018     25 LABEL : Cell Value, String Constant - OEjMUVunBv len=0 
' 0018     26 LABEL : Cell Value, String Constant - pgOGCFSkihf len=0 
' 0018     24 LABEL : Cell Value, String Constant - PMEGcZqSa len=0 
' 0018     27 LABEL : Cell Value, String Constant - tiYOQJgjDLJL len=0 
' 0018     21 LABEL : Cell Value, String Constant - tLVtgn len=0 
' 0018     25 LABEL : Cell Value, String Constant - VRnIrZJEdd len=0 
' 0018     20 LABEL : Cell Value, String Constant - vwNRQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - WOfoebOB len=0 
' 0018     26 LABEL : Cell Value, String Constant - YRwIpDdYyaY len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZEqyKHzsLliO 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     1
... (truncated)

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