Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7eb2260e2b819ad8…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:37 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 80bdba6c800264dce8b49e3b54a4402c SHA-1: 882fd5e423175e88e871f8e93e99b0ac046bde29 SHA-256: 7eb2260e2b819ad80ebe584edf3cd3c7bb7d3e639b03e8075d33901c15619c19
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is configured to execute dangerous formula APIs like RUN. This strongly suggests the macro is designed to download and execute a secondary payload, a common technique for initial execution and further compromise. No specific family could be identified from the available evidence.

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) 6839 bytes
SHA-256: 83f72b35443eb01e873437794beffecc5cb549b5266308c743aaaacc7fd9e5a9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Mfuxvabgd
' 0018     25 LABEL : Cell Value, String Constant - aqpelaSdAx len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D174 
' 0018     21 LABEL : Cell Value, String Constant - eUvJAI len=0 
' 0018     26 LABEL : Cell Value, String Constant - gFXwEzbrqvZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HGYbiy len=0 
' 0018     24 LABEL : Cell Value, String Constant - hXGgMossJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - JTNXcnOixidf len=0 
' 0018     27 LABEL : Cell Value, String Constant - NMhyZeSzyDBY len=0 
' 0018     27 LABEL : Cell Value, String Constant - nQhEtwYWBUUI len=0 
' 0018     23 LABEL : Cell Value, String Constant - pAMEIzYR len=0 
' 0018     27 LABEL : Cell Value, String Constant - QpzilIrKOuCr len=0 
' 0018     20 LABEL : Cell Value, String Constant - RGtUS len=0 
' 0018     20 LABEL : Cell Value, String Constant - sriqu len=0 
' 0018     26 LABEL : Cell Value, String Constant - TiddzdtWNqi len=0 
' 0018     27 LABEL : Cell Value, String Constant - tpUkanaAVkbg len=0 
' 0018     25 LABEL : Cell Value, String Constant - tQHkFxVCkt len=0 
' 0018     27 LABEL : Cell Value, String Constant - UHdkdUCxqvMc len=0 
' 0018     24 LABEL : Cell Value, String Constant - wdQZIgvHs len=0 
' 0018     22 LABEL : Cell Value, String Constant - xjpcArz len=0 
' 0018     26 LABEL : Cell Value, String Constant - XShvJqRdJMP len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZiLCXYuBGq 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 C
... (truncated)

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