Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3a6f4524df4e04b6…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:25:10 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 28e7b7a9d42e7a3725956042afda7263 SHA-1: 8e50b6baeb421c3ff2cffe7c015e29e7f53df9c0 SHA-256: 3a6f4524df4e04b6218c01ba22269aab76ea24711506b4c06889f71f7caff379
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 sheet that contains an Auto_Open defined name, indicating it will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. No specific family could be identified.

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) 6615 bytes
SHA-256: dc9fae87533b195cb6599b9e43e92dc7547dcf34a786d0c6822d063946477341
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  avRfRjH
' 0018     22 LABEL : Cell Value, String Constant - ABotiOC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C191 
' 0018     20 LABEL : Cell Value, String Constant - BBMvt len=0 
' 0018     23 LABEL : Cell Value, String Constant - BIukSDVp len=0 
' 0018     25 LABEL : Cell Value, String Constant - cIpHBOaSRR len=0 
' 0018     23 LABEL : Cell Value, String Constant - CQgGwUHI len=0 
' 0018     21 LABEL : Cell Value, String Constant - dhBmiM len=0 
' 0018     20 LABEL : Cell Value, String Constant - GUsgt len=0 
' 0018     27 LABEL : Cell Value, String Constant - GVJjmqUHexKJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - hCEwDgUF len=0 
' 0018     24 LABEL : Cell Value, String Constant - iFkPjrhyo len=0 
' 0018     25 LABEL : Cell Value, String Constant - KAMiucrZSH len=0 
' 0018     26 LABEL : Cell Value, String Constant - KiVtGehoylI len=0 
' 0018     24 LABEL : Cell Value, String Constant - ktWrWVyUd len=0 
' 0018     22 LABEL : Cell Value, String Constant - maZsCye len=0 
' 0018     26 LABEL : Cell Value, String Constant - QCOaAgglGMT len=0 
' 0018     22 LABEL : Cell Value, String Constant - rohAUaM len=0 
' 0018     22 LABEL : Cell Value, String Constant - sTgAqYY len=0 
' 0018     21 LABEL : Cell Value, String Constant - wQcjnS len=0 
' 0018     25 LABEL : Cell Value, String Constant - zNTRANQTtu len=0 
' 0018     20 LABEL : Cell Value, String Constant - zxHbK 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 LABE
... (truncated)

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