Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1c86b530c5af2d08…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:42 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 52ecd0322d317a5f79bf91785ba139e7 SHA-1: 82fd3729f261caf630b753376d3da8bebe1e9ed9 SHA-256: 1c86b530c5af2d08994bc6aba44c2211dfb3c5b34b9e641ef4bc761105bb73c5
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 defined name, which is a critical heuristic finding. This indicates the macro sheet is configured to automatically execute when the workbook is opened. The presence of dangerous formula APIs further suggests malicious intent, likely to execute arbitrary commands or download further payloads.

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) 6656 bytes
SHA-256: c1552f43f876440567737608590b08ab52500d44aec9121456f1d0506a7dfe77
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  CejmVHxlFnY
' 0018     25 LABEL : Cell Value, String Constant - AJBOhxWyHQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - aUcSzPZnDA len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D151 
' 0018     26 LABEL : Cell Value, String Constant - BbLkeNDiAFl len=0 
' 0018     26 LABEL : Cell Value, String Constant - BRHNdxoOCZm len=0 
' 0018     23 LABEL : Cell Value, String Constant - dEwJidKc len=0 
' 0018     21 LABEL : Cell Value, String Constant - EWYkkj len=0 
' 0018     22 LABEL : Cell Value, String Constant - HFfGSlE len=0 
' 0018     23 LABEL : Cell Value, String Constant - iTowlAdC len=0 
' 0018     22 LABEL : Cell Value, String Constant - KhbbpOZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - LLWnXgJMO len=0 
' 0018     22 LABEL : Cell Value, String Constant - MInFbwU len=0 
' 0018     25 LABEL : Cell Value, String Constant - PanRPpjZyr len=0 
' 0018     20 LABEL : Cell Value, String Constant - prJAH len=0 
' 0018     20 LABEL : Cell Value, String Constant - PToIG len=0 
' 0018     25 LABEL : Cell Value, String Constant - RdwsmiSqNx len=0 
' 0018     24 LABEL : Cell Value, String Constant - sNHTwXiJj len=0 
' 0018     24 LABEL : Cell Value, String Constant - UlkrNPfpc len=0 
' 0018     23 LABEL : Cell Value, String Constant - vItqAZYV len=0 
' 0018     25 LABEL : Cell Value, String Constant - VtqfxzCGDo len=0 
' 0018     26 LABEL : Cell Value, String Constant - xIvmwULlvIO 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
' 00
... (truncated)

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