Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e67e8b4a6f449eb6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:00 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: b861840185482365fd40fd027f76fe87 SHA-1: 8f2ed612c375767290b40e7caf437d2e5702ceb5 SHA-256: e67e8b4a6f449eb667842213f68ede72fb6106cd83fc69111607381f62dabe2f
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 function, which is a known method for executing malicious code within older Excel versions. The presence of dangerous formula APIs in the Auto_Open function indicates an intent to run arbitrary commands. No specific malware family could be identified from the available evidence.

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) 6558 bytes
SHA-256: 40aed4e3eb81647e162f4935a7f17318f44456dd4124f41226f0401f41b57048
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GIR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A140 
' 0018     25 LABEL : Cell Value, String Constant - DCpfjItPPX len=0 
' 0018     21 LABEL : Cell Value, String Constant - EQnSaS len=0 
' 0018     25 LABEL : Cell Value, String Constant - EVcKxBOwEo len=0 
' 0018     27 LABEL : Cell Value, String Constant - FLCBrutrzKxI len=0 
' 0018     24 LABEL : Cell Value, String Constant - hZzhxhYqk len=0 
' 0018     26 LABEL : Cell Value, String Constant - lGuWyJBPMsx len=0 
' 0018     22 LABEL : Cell Value, String Constant - MfWWMLW len=0 
' 0018     25 LABEL : Cell Value, String Constant - oismSYGmIe len=0 
' 0018     27 LABEL : Cell Value, String Constant - qhXaQXyiaWvJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - qMoQpTqP len=0 
' 0018     23 LABEL : Cell Value, String Constant - QyPIPyLY len=0 
' 0018     21 LABEL : Cell Value, String Constant - rEJxJs len=0 
' 0018     22 LABEL : Cell Value, String Constant - RyLQIqS len=0 
' 0018     27 LABEL : Cell Value, String Constant - VlZiZofpgXdZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - vNQVF len=0 
' 0018     25 LABEL : Cell Value, String Constant - xbuYZZOuTT len=0 
' 0018     27 LABEL : Cell Value, String Constant - xPfLdqTSZYAg len=0 
' 0018     20 LABEL : Cell Value, String Constant - xQyuR len=0 
' 0018     20 LABEL : Cell Value, String Constant - zgzVl len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZZGNQFgO 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    
... (truncated)

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