Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 489716640563e2dd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:46 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: 7a608b3811caaa8ec44863eb7e1ebf37 SHA-1: ddedfcc7fee8aa6391f5102533709855f99e2539 SHA-256: 489716640563e2ddad2202c9df3c379ec2ee40690e85f53fa48f459ff5efe4ee
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. Heuristics indicate the presence of an Auto_Open defined name, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains formulas that are flagged as dangerous, suggesting it attempts to run arbitrary commands or download additional payloads. No specific URLs or hashes were extracted, but the technique strongly implies 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) 6695 bytes
SHA-256: 83d8d0be88605df2c352cefb4d6f79bd52f50659f645b69ce3ad4251c4809c33
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 -  rbVBJm
' 0018     21 LABEL : Cell Value, String Constant - adESWH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A179 
' 0018     25 LABEL : Cell Value, String Constant - bZHTpHqjQd len=0 
' 0018     23 LABEL : Cell Value, String Constant - dvzrzQxu len=0 
' 0018     23 LABEL : Cell Value, String Constant - eAGqkvAL len=0 
' 0018     20 LABEL : Cell Value, String Constant - FRIIY len=0 
' 0018     27 LABEL : Cell Value, String Constant - FvtQOYDkXXDX len=0 
' 0018     26 LABEL : Cell Value, String Constant - hpTEWvVnPUR len=0 
' 0018     24 LABEL : Cell Value, String Constant - hUjJnnUcG len=0 
' 0018     22 LABEL : Cell Value, String Constant - OAVLkJN len=0 
' 0018     21 LABEL : Cell Value, String Constant - OlAnUi len=0 
' 0018     27 LABEL : Cell Value, String Constant - plEtigdZQtEL len=0 
' 0018     27 LABEL : Cell Value, String Constant - rHkNwJvZGWlx len=0 
' 0018     20 LABEL : Cell Value, String Constant - RMVqC len=0 
' 0018     26 LABEL : Cell Value, String Constant - rwVCjZKCqeb len=0 
' 0018     27 LABEL : Cell Value, String Constant - ukoPSMUvBJPW len=0 
' 0018     27 LABEL : Cell Value, String Constant - uLoeZUhYwDRT len=0 
' 0018     24 LABEL : Cell Value, String Constant - vZBuTpOcZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - wmUjRD len=0 
' 0018     23 LABEL : Cell Value, String Constant - wTakfapE len=0 
' 0018     23 LABEL : Cell Value, String Constant - wUMIxRqO 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
' 0
... (truncated)

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