Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 75599201e4b66750…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:09 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: efaf7a873a45ca628d256d6c6ee81d74 SHA-1: a2ef1f68f1df4cc88cfc11f383b6a5e73f6192b3 SHA-256: 75599201e4b667500ddbdaba88149f5883c620d1d0c670c678616810ffa04be9
140 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 (XLM) macros, specifically triggering an Auto_Open function. This function is known to be used to execute arbitrary code, often to download and run a second-stage payload from a remote source. The presence of dangerous formula APIs in the Auto_Open macro further supports this malicious intent.

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) 6934 bytes
SHA-256: 0aed41ac5b69c6e95604e52bd21ed93c0e6f723342e4eed3c548f1a358ed9195
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DLOkZEDKeTG
' 0018     27 LABEL : Cell Value, String Constant - ASggpyxGOBzL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D173 
' 0018     24 LABEL : Cell Value, String Constant - GRkIsPCyh len=0 
' 0018     22 LABEL : Cell Value, String Constant - gwvOuai len=0 
' 0018     23 LABEL : Cell Value, String Constant - HjIpzeJD len=0 
' 0018     26 LABEL : Cell Value, String Constant - hoBIjIvbcGh len=0 
' 0018     26 LABEL : Cell Value, String Constant - hwmOGzEckSL len=0 
' 0018     26 LABEL : Cell Value, String Constant - IjPXvXilstX len=0 
' 0018     20 LABEL : Cell Value, String Constant - ixGTt len=0 
' 0018     27 LABEL : Cell Value, String Constant - jPYflSjPRpWk len=0 
' 0018     20 LABEL : Cell Value, String Constant - JSPDt len=0 
' 0018     27 LABEL : Cell Value, String Constant - JTCxxesVRiCh len=0 
' 0018     25 LABEL : Cell Value, String Constant - nIwxgeZYqL len=0 
' 0018     25 LABEL : Cell Value, String Constant - PHbGyjYLWq len=0 
' 0018     24 LABEL : Cell Value, String Constant - PSSmQaRYm len=0 
' 0018     26 LABEL : Cell Value, String Constant - tmxNHUPOBbm len=0 
' 0018     25 LABEL : Cell Value, String Constant - UKIYJcqiWX len=0 
' 0018     24 LABEL : Cell Value, String Constant - UkLRaZacj len=0 
' 0018     23 LABEL : Cell Value, String Constant - XIvINGyC len=0 
' 0018     27 LABEL : Cell Value, String Constant - ywKhJmFAJTOG len=0 
' 0018     20 LABEL : Cell Value, String Constant - zPaiL 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 Co
... (truncated)

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