Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8df8f8fb1198cd82…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:39:55 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 7ef24cca88d58aee868cc9c923dec4da SHA-1: 42071a4d1cc09c21c22d5e09864e88c207f8723a SHA-256: 8df8f8fb1198cd825246e2092c002df026bce506bd7c34700e98a4f0d9bb7c34
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 triggering an Auto_Open function. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs like RUN further suggests malicious intent, likely to download and execute 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) 6653 bytes
SHA-256: 06dbfab355f03c62c5f5fa0693f0983372afe24f71ce6f8298f85c3a60c5bd75
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 -  XbPVMrIfwZy
' 0018     23 LABEL : Cell Value, String Constant - ACuCkNuU len=0 
' 0018     20 LABEL : Cell Value, String Constant - apFNA len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A189 
' 0018     20 LABEL : Cell Value, String Constant - bYeLY len=0 
' 0018     24 LABEL : Cell Value, String Constant - EfDXbtMOo len=0 
' 0018     27 LABEL : Cell Value, String Constant - ehhYPMQbLhjb len=0 
' 0018     23 LABEL : Cell Value, String Constant - EvpAuKTt len=0 
' 0018     26 LABEL : Cell Value, String Constant - FnRZLoZpBsd len=0 
' 0018     23 LABEL : Cell Value, String Constant - JEyASFZR len=0 
' 0018     23 LABEL : Cell Value, String Constant - kfdRuYUB len=0 
' 0018     21 LABEL : Cell Value, String Constant - lfLJTm len=0 
' 0018     20 LABEL : Cell Value, String Constant - OSZTw len=0 
' 0018     23 LABEL : Cell Value, String Constant - pAzZfptF len=0 
' 0018     23 LABEL : Cell Value, String Constant - QCXfnZoJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - QYnfeIYRGUmX len=0 
' 0018     25 LABEL : Cell Value, String Constant - sQBWnJmQMj len=0 
' 0018     20 LABEL : Cell Value, String Constant - VOOyF len=0 
' 0018     25 LABEL : Cell Value, String Constant - wUlzVeTYdO len=0 
' 0018     26 LABEL : Cell Value, String Constant - yTKCOzTtfHN len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZEEGtgrtBte len=0 
' 0018     23 LABEL : Cell Value, String Constant - zjCNPLpG 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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