Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f1711d1e9974ad09…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:48 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: 728717e6ecf833b9297a97024e6a84fb SHA-1: a2b33e59811a18cce0d179bf6033bde4c1342240 SHA-256: f1711d1e9974ad09dda4232e862292775f4391949893966096b2b16e62b3674d
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros, specifically an Auto_Open defined name that utilizes dangerous formula APIs like RUN. This suggests the macro is designed to execute arbitrary code upon opening the document, likely to download and run a second-stage payload. No specific family could be identified due to the generic nature of the macro execution.

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) 6599 bytes
SHA-256: 1fbf7652969488ac492010575ee3e4f8672a34594328b3ea3bf551c8f5b28d60
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 -  nQNvYvkJOx
' 0018     23 LABEL : Cell Value, String Constant - aiCUCaaW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D142 
' 0018     21 LABEL : Cell Value, String Constant - axuCLy len=0 
' 0018     26 LABEL : Cell Value, String Constant - fEgcYJjLleg len=0 
' 0018     21 LABEL : Cell Value, String Constant - FocyGe len=0 
' 0018     24 LABEL : Cell Value, String Constant - GFmkOxuQb len=0 
' 0018     24 LABEL : Cell Value, String Constant - HpfNvVZwf len=0 
' 0018     26 LABEL : Cell Value, String Constant - IGrFbeiJrSk len=0 
' 0018     22 LABEL : Cell Value, String Constant - JrFwFUc len=0 
' 0018     24 LABEL : Cell Value, String Constant - KVIsAOvPf len=0 
' 0018     26 LABEL : Cell Value, String Constant - lkrrSWIubjp len=0 
' 0018     27 LABEL : Cell Value, String Constant - MGWeQlpZePmI len=0 
' 0018     22 LABEL : Cell Value, String Constant - mQcTVLb len=0 
' 0018     21 LABEL : Cell Value, String Constant - NJJepK len=0 
' 0018     26 LABEL : Cell Value, String Constant - OCVAemGmwHj len=0 
' 0018     24 LABEL : Cell Value, String Constant - pNBMeDpwm len=0 
' 0018     21 LABEL : Cell Value, String Constant - PQmZir len=0 
' 0018     24 LABEL : Cell Value, String Constant - pxjSCoeAv len=0 
' 0018     26 LABEL : Cell Value, String Constant - UzNqrfOCfkc len=0 
' 0018     20 LABEL : Cell Value, String Constant - wfbUG len=0 
' 0018     20 LABEL : Cell Value, String Constant - yQTDy 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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