Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 44502024be3a94ff…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:08 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: 4cf716e57badbb6a7c00d8c9c31690e1 SHA-1: e113c1707d1c957ac7d2b9e9b770626668cc9860 SHA-256: 44502024be3a94ff7f8b1e625c46728244226dfdb288f9f2f4e16e2d01426930
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 common technique for executing malicious code upon opening. The critical heuristics indicate the presence of dangerous formula APIs within the XLM macro, suggesting it's designed to run arbitrary commands. No specific family could be identified, but the execution method is clear.

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) 6808 bytes
SHA-256: 0ee69d2a59ff01da9e7fd0bb6268c6a0ede276e6e4118767bd1cea8c69130902
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HmRwmHkJd
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A186 
' 0018     22 LABEL : Cell Value, String Constant - bGzlNDI len=0 
' 0018     20 LABEL : Cell Value, String Constant - BlKMT len=0 
' 0018     23 LABEL : Cell Value, String Constant - bLYkxalK len=0 
' 0018     21 LABEL : Cell Value, String Constant - bpjQBq len=0 
' 0018     26 LABEL : Cell Value, String Constant - DkqlkqeSour len=0 
' 0018     25 LABEL : Cell Value, String Constant - ESlBuHJOZR len=0 
' 0018     26 LABEL : Cell Value, String Constant - hhaNOlWjWcD len=0 
' 0018     22 LABEL : Cell Value, String Constant - HOHnYYz len=0 
' 0018     24 LABEL : Cell Value, String Constant - iSxmscojb len=0 
' 0018     22 LABEL : Cell Value, String Constant - IWbLCuK len=0 
' 0018     20 LABEL : Cell Value, String Constant - kUhKf len=0 
' 0018     25 LABEL : Cell Value, String Constant - lgjGPlAOfB len=0 
' 0018     22 LABEL : Cell Value, String Constant - NbWVXhp len=0 
' 0018     22 LABEL : Cell Value, String Constant - PJaAYZX len=0 
' 0018     25 LABEL : Cell Value, String Constant - RkpvLOBqAJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - RWuRDek len=0 
' 0018     21 LABEL : Cell Value, String Constant - tocbYd len=0 
' 0018     22 LABEL : Cell Value, String Constant - UAPPJai len=0 
' 0018     21 LABEL : Cell Value, String Constant - yVNtIW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZqRmKckNnO 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 LABELSS
... (truncated)

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