Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 415c405c7b06b166…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:22 Authoring application: Microsoft Excel First seen: 2021-09-18
MD5: 04a503dec3640f8288fe1401ecdc8000 SHA-1: dbaaf6bd0e8aeb8cc537e482ffed73ead14880a7 SHA-256: 415c405c7b06b166c79fbffa120287b90ac9cf9515e517c65bb6d942a34bde03
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically triggering an Auto_Open function. This indicates an attempt to execute arbitrary code upon opening the document. The presence of 'risky-formula=2; RUN=0' suggests the macro is designed to run commands or download additional content, aligning with a downloader or initial execution stage.

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) 6943 bytes
SHA-256: 4e3cf54c24d0e2c7f262855a319c98706314b5fdb8867a9501c3f1e8dc1287ad
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 -  IkHgKDMvnSP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F140 
' 0018     26 LABEL : Cell Value, String Constant - gtaiizvJFZo len=0 
' 0018     24 LABEL : Cell Value, String Constant - iDNMhHsfD len=0 
' 0018     27 LABEL : Cell Value, String Constant - JqNFnpRpJaOr len=0 
' 0018     24 LABEL : Cell Value, String Constant - jskjDxrtP len=0 
' 0018     20 LABEL : Cell Value, String Constant - kurjB len=0 
' 0018     25 LABEL : Cell Value, String Constant - LHfEEbOZUU len=0 
' 0018     21 LABEL : Cell Value, String Constant - myHSlZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - NCptWqQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - oDwkaVm len=0 
' 0018     26 LABEL : Cell Value, String Constant - osTSBebYunX len=0 
' 0018     23 LABEL : Cell Value, String Constant - pBqHYhYW len=0 
' 0018     24 LABEL : Cell Value, String Constant - PqbijdZlp len=0 
' 0018     26 LABEL : Cell Value, String Constant - SqILyHDYvLr len=0 
' 0018     21 LABEL : Cell Value, String Constant - tVxmez len=0 
' 0018     21 LABEL : Cell Value, String Constant - UPryGn len=0 
' 0018     25 LABEL : Cell Value, String Constant - virgrcPEaR len=0 
' 0018     26 LABEL : Cell Value, String Constant - wdzNBTDFSOD len=0 
' 0018     27 LABEL : Cell Value, String Constant - XtvWhwzqlrzE len=0 
' 0018     23 LABEL : Cell Value, String Constant - YKAGaHlf len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZJZsdMj 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

... (truncated)

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