Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0b128100c1cf37ee…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:46:43 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 524a49a2fc98d1ffa487c59cbf016d3c SHA-1: 4d12a3e62d2daa47fa36090c485a27d1aa754452 SHA-256: 0b128100c1cf37ee9d9dd3a6e6f43241c2bed83dc8a3384bff97086bb6618b95
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 known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download further payloads. No specific family could be identified, but the technique is common for initial execution.

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) 6863 bytes
SHA-256: d05e39c0e0ef3935dfb0adceda9c44942b3d285c1a81fed1a0a8667ed9295279
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 -  DMrlNGMs
' 0018     21 LABEL : Cell Value, String Constant - ACGvCz len=0 
' 0018     21 LABEL : Cell Value, String Constant - AquSDD len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I193 
' 0018     27 LABEL : Cell Value, String Constant - bXeERpCZGZNL len=0 
' 0018     26 LABEL : Cell Value, String Constant - EsRqRYwXDiH len=0 
' 0018     22 LABEL : Cell Value, String Constant - fmIXmSt len=0 
' 0018     27 LABEL : Cell Value, String Constant - GWKTpZEqpyiE len=0 
' 0018     27 LABEL : Cell Value, String Constant - iFmHDCuDOumg len=0 
' 0018     20 LABEL : Cell Value, String Constant - lgXHE len=0 
' 0018     20 LABEL : Cell Value, String Constant - mGggf len=0 
' 0018     22 LABEL : Cell Value, String Constant - oPzlVbo len=0 
' 0018     24 LABEL : Cell Value, String Constant - PerCDzGnI len=0 
' 0018     23 LABEL : Cell Value, String Constant - pjRwgnCN len=0 
' 0018     25 LABEL : Cell Value, String Constant - qrljuQXLiI len=0 
' 0018     27 LABEL : Cell Value, String Constant - RsDlNJJcwZXM len=0 
' 0018     26 LABEL : Cell Value, String Constant - ssfVYRufWKv len=0 
' 0018     21 LABEL : Cell Value, String Constant - TTeOVT len=0 
' 0018     20 LABEL : Cell Value, String Constant - vAKJt len=0 
' 0018     21 LABEL : Cell Value, String Constant - XXiGZH len=0 
' 0018     20 LABEL : Cell Value, String Constant - YvjFo len=0 
' 0018     26 LABEL : Cell Value, String Constant - YxyOmIAvTCg 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     1
... (truncated)

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