Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1f32cc5743870fd4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:01 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 51c1be6c9c33765e0e7657070482f25a SHA-1: b7b5efda69c0f5e265bb424d0dad1c161972946e SHA-256: 1f32cc5743870fd4d634f1e9aadf78cc57f4648a72818b8baeed7031bd991c28
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 upon opening the workbook. The presence of dangerous formula APIs further increases the risk. While the exact payload is not discernible from the provided evidence, the mechanism strongly suggests an attempt to execute arbitrary code.

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) 6683 bytes
SHA-256: 597beb5aad61852781edfd4ded4336023a7b7b5ce24ef4bdb4ad2c6aa1fe0766
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 -  iWnYWT
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A167 
' 0018     20 LABEL : Cell Value, String Constant - BNFKd len=0 
' 0018     23 LABEL : Cell Value, String Constant - ehDjWume len=0 
' 0018     25 LABEL : Cell Value, String Constant - hQcewWlwXE len=0 
' 0018     20 LABEL : Cell Value, String Constant - HVlST len=0 
' 0018     23 LABEL : Cell Value, String Constant - jKOvMOSR len=0 
' 0018     27 LABEL : Cell Value, String Constant - jlFDIkJXOqdg len=0 
' 0018     21 LABEL : Cell Value, String Constant - ksnfGp len=0 
' 0018     21 LABEL : Cell Value, String Constant - LeszOv len=0 
' 0018     25 LABEL : Cell Value, String Constant - LHOKvWGegG len=0 
' 0018     22 LABEL : Cell Value, String Constant - mkGcUfT len=0 
' 0018     23 LABEL : Cell Value, String Constant - OxAAyQmA len=0 
' 0018     25 LABEL : Cell Value, String Constant - QUZzFzmpoe len=0 
' 0018     26 LABEL : Cell Value, String Constant - rltXiVaWUSn len=0 
' 0018     24 LABEL : Cell Value, String Constant - rpwiALgnR len=0 
' 0018     24 LABEL : Cell Value, String Constant - tfoHDtibA len=0 
' 0018     25 LABEL : Cell Value, String Constant - tIarjndJNK len=0 
' 0018     27 LABEL : Cell Value, String Constant - TLjrfsFbyEBW len=0 
' 0018     24 LABEL : Cell Value, String Constant - usrtRViQJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - vOvrJbXtO len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZsqSNX 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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