Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef9ca16df8a70d19…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:13 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: ad6d853b12cd1ff34a33419904d75496 SHA-1: 752402e540e84b8c0a0c9dc2fcdd3db49d6d0f59 SHA-256: ef9ca16df8a70d19827bcdefc2a7e7821011b43ec0b6e7f4ec990d2843678f29
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs further suggests malicious intent. Without further script content or network indicators, the exact payload and family remain unknown.

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) 6693 bytes
SHA-256: d23c17d350e2259c4cc43ffb89a715334a8d7f3eb103fe845752f4d6fc7938b5
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 -  lfGCiWMnMvO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G145 
' 0018     22 LABEL : Cell Value, String Constant - BJIxCRh len=0 
' 0018     26 LABEL : Cell Value, String Constant - BLUluHVNrum len=0 
' 0018     20 LABEL : Cell Value, String Constant - BnStl len=0 
' 0018     23 LABEL : Cell Value, String Constant - ByGdqwnu len=0 
' 0018     27 LABEL : Cell Value, String Constant - FzcqEUpYGXrK len=0 
' 0018     23 LABEL : Cell Value, String Constant - FzhRnXjn len=0 
' 0018     24 LABEL : Cell Value, String Constant - hrOINpBxb len=0 
' 0018     27 LABEL : Cell Value, String Constant - iIlXYpYSyQZf len=0 
' 0018     23 LABEL : Cell Value, String Constant - jJyxRHgB len=0 
' 0018     21 LABEL : Cell Value, String Constant - lyGBHY len=0 
' 0018     22 LABEL : Cell Value, String Constant - QJSABDm len=0 
' 0018     24 LABEL : Cell Value, String Constant - rthzsdykp len=0 
' 0018     22 LABEL : Cell Value, String Constant - RULkQNJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - rvDQj len=0 
' 0018     25 LABEL : Cell Value, String Constant - UihFWnzFNC len=0 
' 0018     24 LABEL : Cell Value, String Constant - vbkvfQmvo len=0 
' 0018     23 LABEL : Cell Value, String Constant - vDEYeYrs len=0 
' 0018     25 LABEL : Cell Value, String Constant - VLdXOaRcpZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - yBoVnHqPj len=0 
' 0018     23 LABEL : Cell Value, String Constant - YICIAYgW 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 
... (truncated)

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