Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7c247db5a67e1987…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:36 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: d18bc8a9a2caddd23aefe36821c7285a SHA-1: d246a74e094393fe8dad45b63d3c951cfe1060ae SHA-256: 7c247db5a67e1987993599613c25fe144c3d9567aa5056a57ec9587bd21b26c2
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically triggering an Auto_Open macro. This technique is often used to download and execute a secondary payload. The presence of dangerous formula APIs like RUN further supports this malicious intent.

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: 683d0403d4b39623bd11db0ef022278da86564fa778ff259e22b946f1fa7ec75
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KXeSmzAA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F185 
' 0018     20 LABEL : Cell Value, String Constant - aYCvp len=0 
' 0018     27 LABEL : Cell Value, String Constant - bGFQMXHbkOpB len=0 
' 0018     27 LABEL : Cell Value, String Constant - dlnwKcLjPMzI len=0 
' 0018     23 LABEL : Cell Value, String Constant - eQcQWSXu len=0 
' 0018     20 LABEL : Cell Value, String Constant - hgGmj len=0 
' 0018     25 LABEL : Cell Value, String Constant - hLAtELgJTc len=0 
' 0018     26 LABEL : Cell Value, String Constant - hRvGohFnUrN len=0 
' 0018     27 LABEL : Cell Value, String Constant - iKRdWyYqAcOH len=0 
' 0018     23 LABEL : Cell Value, String Constant - KelmolyR len=0 
' 0018     26 LABEL : Cell Value, String Constant - KZGmGlpPxtf len=0 
' 0018     21 LABEL : Cell Value, String Constant - MUULgB len=0 
' 0018     24 LABEL : Cell Value, String Constant - NbigrHhSq len=0 
' 0018     20 LABEL : Cell Value, String Constant - QGJTD len=0 
' 0018     25 LABEL : Cell Value, String Constant - QPdOMOpZVm len=0 
' 0018     20 LABEL : Cell Value, String Constant - QRiMG len=0 
' 0018     22 LABEL : Cell Value, String Constant - smUWeSR len=0 
' 0018     27 LABEL : Cell Value, String Constant - syforxjJibHG len=0 
' 0018     22 LABEL : Cell Value, String Constant - VYBoimO len=0 
' 0018     20 LABEL : Cell Value, String Constant - XEiSz len=0 
' 0018     25 LABEL : Cell Value, String Constant - XfJsagNtRs 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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