Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 171b3dbe64a83474…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:44 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: ba37e52f4413f49bcc687f8be1d8ac15 SHA-1: 24512e64e724bfbb5f8979f131a53a6ba8f6232e SHA-256: 171b3dbe64a83474ce1c307ab43241ffbe3b75fc23981ae076cf634f21050f16
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. This function is designed to automatically execute when the workbook is opened, indicating an attempt to run malicious code. The presence of dangerous formula APIs within the macro sheet further supports its malicious intent, likely for downloading and executing 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) 6796 bytes
SHA-256: 354a715bbba60fae58fdb2e1eb474c97bba9fd22537a647b43a86d2a2f25baf3
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  BIZBbLhxiP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H154 
' 0018     25 LABEL : Cell Value, String Constant - CpVUxmlrjx len=0 
' 0018     22 LABEL : Cell Value, String Constant - EaBeiLk len=0 
' 0018     24 LABEL : Cell Value, String Constant - fCHnqlwJn len=0 
' 0018     22 LABEL : Cell Value, String Constant - FQFEYQo len=0 
' 0018     23 LABEL : Cell Value, String Constant - JviICpkz len=0 
' 0018     22 LABEL : Cell Value, String Constant - KCZKIfU len=0 
' 0018     25 LABEL : Cell Value, String Constant - LIlewabfXX len=0 
' 0018     25 LABEL : Cell Value, String Constant - lvwdJIuFlj len=0 
' 0018     20 LABEL : Cell Value, String Constant - OaNTa len=0 
' 0018     20 LABEL : Cell Value, String Constant - ojWAr len=0 
' 0018     20 LABEL : Cell Value, String Constant - ORDaB len=0 
' 0018     22 LABEL : Cell Value, String Constant - OvNWvHW len=0 
' 0018     25 LABEL : Cell Value, String Constant - PhjfhZatJA len=0 
' 0018     24 LABEL : Cell Value, String Constant - pzxOKXdyj len=0 
' 0018     26 LABEL : Cell Value, String Constant - RGYuzDAmxTw len=0 
' 0018     27 LABEL : Cell Value, String Constant - shsACXTGSPUw len=0 
' 0018     20 LABEL : Cell Value, String Constant - sVgmK len=0 
' 0018     20 LABEL : Cell Value, String Constant - VojHi len=0 
' 0018     23 LABEL : Cell Value, String Constant - xuFVPoLi len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZLaGRyxYuBu 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     10 L
... (truncated)

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