Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 25fdb848ed18a5e8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:24 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: d2def8355a6e33a00a891f4fedbf944b SHA-1: 04b05c4757a1121808c236d3bb9c1fcb995d7b92 SHA-256: 25fdb848ed18a5e8fed031cbbab40b1e8e59867662abd468c208f00b5512c0a2
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. Static analysis detected an Auto_Open defined name, indicating that the macro sheet will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload.

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) 6456 bytes
SHA-256: 09a9a617d2ad7fafa3660f165c7b04955f3eada10a3bb3f04809e73f3f7e58bd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nKvTu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D174 
' 0018     26 LABEL : Cell Value, String Constant - aWpIziLElOD len=0 
' 0018     21 LABEL : Cell Value, String Constant - DfTqTO len=0 
' 0018     27 LABEL : Cell Value, String Constant - DMGUruxEuOdz len=0 
' 0018     22 LABEL : Cell Value, String Constant - eAzYsAV len=0 
' 0018     22 LABEL : Cell Value, String Constant - gfhYppl len=0 
' 0018     27 LABEL : Cell Value, String Constant - GjoVJDDzOATU len=0 
' 0018     20 LABEL : Cell Value, String Constant - HBlqc len=0 
' 0018     26 LABEL : Cell Value, String Constant - ksoaWbEBsIg len=0 
' 0018     25 LABEL : Cell Value, String Constant - lwbEwjJDXT len=0 
' 0018     23 LABEL : Cell Value, String Constant - MjDIOopq len=0 
' 0018     27 LABEL : Cell Value, String Constant - oHCqdNEHmgqL len=0 
' 0018     22 LABEL : Cell Value, String Constant - OnUldSW len=0 
' 0018     26 LABEL : Cell Value, String Constant - qTFXuKyOfDf len=0 
' 0018     20 LABEL : Cell Value, String Constant - qUWOu len=0 
' 0018     20 LABEL : Cell Value, String Constant - qZcVP len=0 
' 0018     24 LABEL : Cell Value, String Constant - TCjJEoORP len=0 
' 0018     26 LABEL : Cell Value, String Constant - tIaNyfTtakp len=0 
' 0018     24 LABEL : Cell Value, String Constant - vffIBHIzN len=0 
' 0018     27 LABEL : Cell Value, String Constant - XcHgbOpMJCKF len=0 
' 0018     23 LABEL : Cell Value, String Constant - YFTaKWsR 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
' 0
... (truncated)

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