Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0d399874852ed679…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:20 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: b6e88b592b4b2ff04edca9ffceee4400 SHA-1: bf6d4e69b6ae482635ae3dc8d601a600a92fc1b7 SHA-256: 0d399874852ed6793eefd965d3b50ee5f8b8b5f05242c8d014571292c52d93f4
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a critical finding indicating automatic execution upon opening. The macro sheet also utilizes dangerous formula APIs, specifically the RUN function, suggesting it is designed to execute arbitrary commands. The presence of an Auto_Open entry and the use of the RUN function strongly indicate a malicious intent to execute a 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) 6730 bytes
SHA-256: be5f5b2681b13f524e5135be5f095a92f278b9a28be740cd866e986ac83640fd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xnjTnv
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E140 
' 0018     27 LABEL : Cell Value, String Constant - FglKUbsAzacc len=0 
' 0018     26 LABEL : Cell Value, String Constant - FKKYcMajVMI len=0 
' 0018     25 LABEL : Cell Value, String Constant - GVHuFQXOUc len=0 
' 0018     26 LABEL : Cell Value, String Constant - JiYxstoeqRR len=0 
' 0018     20 LABEL : Cell Value, String Constant - JUgVq len=0 
' 0018     26 LABEL : Cell Value, String Constant - jxMXijeKbEg len=0 
' 0018     26 LABEL : Cell Value, String Constant - LFirtVgCboC len=0 
' 0018     26 LABEL : Cell Value, String Constant - MPCjYvyvtZS len=0 
' 0018     24 LABEL : Cell Value, String Constant - oYIkaVXER len=0 
' 0018     24 LABEL : Cell Value, String Constant - PNSfNYSNG len=0 
' 0018     22 LABEL : Cell Value, String Constant - QcQwSZd len=0 
' 0018     25 LABEL : Cell Value, String Constant - TdEKHLfIaH len=0 
' 0018     25 LABEL : Cell Value, String Constant - tjPidumiLI len=0 
' 0018     26 LABEL : Cell Value, String Constant - ttIaTbWjctx len=0 
' 0018     26 LABEL : Cell Value, String Constant - UyGFSirBatj len=0 
' 0018     27 LABEL : Cell Value, String Constant - VxygCZyGoVSg len=0 
' 0018     26 LABEL : Cell Value, String Constant - wpZBrOUnBFL len=0 
' 0018     26 LABEL : Cell Value, String Constant - XjDalhAXUtd len=0 
' 0018     20 LABEL : Cell Value, String Constant - YtPNf len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZgXWa 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 C
... (truncated)

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