Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 619dcbb1824cc104…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:23 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 5bdd5d1df513857cb81ff472c0a2e668 SHA-1: 7a39f299d2bff43c54e4a6916346251fae1a05ff SHA-256: 619dcbb1824cc10420088befcacb55d0eb02123ef5fc4693251c1466594dca2c
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically an Auto_Open defined name. This indicates an attempt to automatically execute code when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a second-stage payload, a common technique for malware delivery.

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) 6536 bytes
SHA-256: 1f02fba0fef5931d0fa177429c8a8f8b1715761377999a92ab4c0fc5ed09b436
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  szdgRJO
' 0018     23 LABEL : Cell Value, String Constant - AHKXtziy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F131 
' 0018     23 LABEL : Cell Value, String Constant - bETKlwyQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - eBxnYKCqGs len=0 
' 0018     23 LABEL : Cell Value, String Constant - EdJOEjnr len=0 
' 0018     27 LABEL : Cell Value, String Constant - FcqFuZnQPxNP len=0 
' 0018     24 LABEL : Cell Value, String Constant - FKXsqsqZb len=0 
' 0018     25 LABEL : Cell Value, String Constant - kMOxliQRXU len=0 
' 0018     27 LABEL : Cell Value, String Constant - LMsmwtubdnUM len=0 
' 0018     21 LABEL : Cell Value, String Constant - nsEKCj len=0 
' 0018     21 LABEL : Cell Value, String Constant - nYQlZq len=0 
' 0018     21 LABEL : Cell Value, String Constant - PvxHTA len=0 
' 0018     26 LABEL : Cell Value, String Constant - SekhNNaFiAQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - SfhawxkSvexn len=0 
' 0018     23 LABEL : Cell Value, String Constant - TIztzPOm len=0 
' 0018     26 LABEL : Cell Value, String Constant - TVyoHHAdOYq len=0 
' 0018     24 LABEL : Cell Value, String Constant - UdZDcWCgr len=0 
' 0018     20 LABEL : Cell Value, String Constant - wjNct len=0 
' 0018     27 LABEL : Cell Value, String Constant - yJmsFGZbUbZD len=0 
' 0018     24 LABEL : Cell Value, String Constant - YqETmparW len=0 
' 0018     23 LABEL : Cell Value, String Constant - yvSKLqGf 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
... (truncated)

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