Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3e745ba3ce0a1af1…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:21 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 8ba82bed643e782f609f45cbc569a7b8 SHA-1: 3b3ff978435235162c1cbdb7e398ce7fb2c91973 SHA-256: 3e745ba3ce0a1af1e8c6ddbdde97009f9380f5d5efdbf8c3e926390a48f1e0c9
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 with an Auto_Open entry, which is a known method for executing malicious code. The macro sheet contains dangerous formula APIs, suggesting it is designed to run arbitrary commands upon opening. No specific family could be identified, and no external IOCs were extracted.

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) 6595 bytes
SHA-256: b152d3a052ad368e98c23be78c494372945033e307c792424178a0983954a44c
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 -  yzW
' 0018     20 LABEL : Cell Value, String Constant - ApmBn len=0 
' 0018     22 LABEL : Cell Value, String Constant - aqkzSrm len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F173 
' 0018     20 LABEL : Cell Value, String Constant - DsgvY len=0 
' 0018     21 LABEL : Cell Value, String Constant - eOSnOh len=0 
' 0018     26 LABEL : Cell Value, String Constant - fIJdjoLxKcG len=0 
' 0018     27 LABEL : Cell Value, String Constant - kEKFrsZpQTOA len=0 
' 0018     26 LABEL : Cell Value, String Constant - KUNbASLlFvF len=0 
' 0018     23 LABEL : Cell Value, String Constant - MNPBCOEY len=0 
' 0018     21 LABEL : Cell Value, String Constant - mQRXBx len=0 
' 0018     22 LABEL : Cell Value, String Constant - nnQkoTV len=0 
' 0018     26 LABEL : Cell Value, String Constant - rdoNphkBQYW len=0 
' 0018     21 LABEL : Cell Value, String Constant - TdFbVs len=0 
' 0018     22 LABEL : Cell Value, String Constant - USLUwvq len=0 
' 0018     27 LABEL : Cell Value, String Constant - xBIdHtwSLRhX len=0 
' 0018     23 LABEL : Cell Value, String Constant - xoEalcRD len=0 
' 0018     23 LABEL : Cell Value, String Constant - xuGXAQlB len=0 
' 0018     24 LABEL : Cell Value, String Constant - YGsXaDTui len=0 
' 0018     22 LABEL : Cell Value, String Constant - YxYuVcy len=0 
' 0018     27 LABEL : Cell Value, String Constant - zaVvjNPLvStS len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZSWlX 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 LABELS
... (truncated)

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