Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b228799ff3606552…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:24:35 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: dbf1a13007c52303d385b031d57fdd0e SHA-1: ddcd64b958752b01133a102dbb2cea53746a5d77 SHA-256: b228799ff3606552fd825e5aec77fa288c28c5207d98b7a5e6e89a6fc8d58724
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 finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is designed to execute arbitrary commands upon opening, likely to download and run a secondary 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) 6564 bytes
SHA-256: 63c93705296025ea7cfe2e48d3991efd24975db3f3d9e62609a3820b858583dd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HHFysQGu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G146 
' 0018     23 LABEL : Cell Value, String Constant - CvzXnfuS len=0 
' 0018     25 LABEL : Cell Value, String Constant - CwNdafviDv len=0 
' 0018     24 LABEL : Cell Value, String Constant - CzwVTFcXM len=0 
' 0018     23 LABEL : Cell Value, String Constant - FUeJvcOT len=0 
' 0018     26 LABEL : Cell Value, String Constant - FxpSebdgZvy len=0 
' 0018     26 LABEL : Cell Value, String Constant - IYWkLvMpgCs len=0 
' 0018     21 LABEL : Cell Value, String Constant - jpgMpA len=0 
' 0018     20 LABEL : Cell Value, String Constant - KcqzB len=0 
' 0018     25 LABEL : Cell Value, String Constant - lrvPmxYOrJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - lzKqq len=0 
' 0018     27 LABEL : Cell Value, String Constant - MzuIkPwKXXgg len=0 
' 0018     24 LABEL : Cell Value, String Constant - nXWEpmTSx len=0 
' 0018     27 LABEL : Cell Value, String Constant - PiTrTTgFcMGo len=0 
' 0018     21 LABEL : Cell Value, String Constant - PmhnwJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - PRWinJBN len=0 
' 0018     26 LABEL : Cell Value, String Constant - ReCsQolxcKo len=0 
' 0018     27 LABEL : Cell Value, String Constant - tbtlcowXMlQW len=0 
' 0018     26 LABEL : Cell Value, String Constant - tHjbsCpoHSe len=0 
' 0018     21 LABEL : Cell Value, String Constant - xishat len=0 
' 0018     24 LABEL : Cell Value, String Constant - yNXVLPfhM 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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