Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a5d5dc0c31544abe…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:22 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 30d9f042c22c36b63131424259716438 SHA-1: 6ecad5135fc7b349f02810005f03686da7ef5a40 SHA-256: a5d5dc0c31544abe9118a7ab753845048d035ea2a43f88a4dd7dd7552ef559cd
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. Static analysis detected an Auto_Open defined name, indicating that the macro will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely leading to further exploitation or payload delivery.

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) 6611 bytes
SHA-256: 22483eae15e5b2ae7ceb4f17354292e6f534a900cdea38b7486c49fe7fee6ff7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tqGY
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I164 
' 0018     23 LABEL : Cell Value, String Constant - AWPHQzHP len=0 
' 0018     20 LABEL : Cell Value, String Constant - bfDKS len=0 
' 0018     27 LABEL : Cell Value, String Constant - btPfqVTlGYiY len=0 
' 0018     25 LABEL : Cell Value, String Constant - CjOnGevFOs len=0 
' 0018     21 LABEL : Cell Value, String Constant - DqKVEk len=0 
' 0018     24 LABEL : Cell Value, String Constant - EAoghPyUt len=0 
' 0018     20 LABEL : Cell Value, String Constant - goNbf len=0 
' 0018     25 LABEL : Cell Value, String Constant - hKzoyHZICz len=0 
' 0018     23 LABEL : Cell Value, String Constant - hUqRLmOx len=0 
' 0018     21 LABEL : Cell Value, String Constant - NmgoAX len=0 
' 0018     23 LABEL : Cell Value, String Constant - qmoxEhao len=0 
' 0018     27 LABEL : Cell Value, String Constant - sflgZXXkpYec len=0 
' 0018     26 LABEL : Cell Value, String Constant - UBydBjCNIzc len=0 
' 0018     22 LABEL : Cell Value, String Constant - UyDytMv len=0 
' 0018     20 LABEL : Cell Value, String Constant - ViIfV len=0 
' 0018     21 LABEL : Cell Value, String Constant - XHhIxH len=0 
' 0018     21 LABEL : Cell Value, String Constant - XTBaiI len=0 
' 0018     23 LABEL : Cell Value, String Constant - XYLaFCwe len=0 
' 0018     27 LABEL : Cell Value, String Constant - ybhvNFUofsFs len=0 
' 0018     21 LABEL : Cell Value, String Constant - zpcVDc 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 LABELSST
... (truncated)

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