Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 85517ef7f084352e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:54 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: cd3b858a49ac0df8c0e37c09799de58c SHA-1: eaa16bb12200caed6051a5003137c6dfff0c1d3a SHA-256: 85517ef7f084352ee6c0f19309a90a56ad91a4d67953e95c3151fabafea00878
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet, identified by the presence of an Auto_Open defined name and the use of dangerous formula APIs. This indicates the workbook is designed to automatically execute code upon opening. The macro sheet likely contains obfuscated instructions to download and execute a malicious payload, a common technique for initial execution.

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) 6776 bytes
SHA-256: 70afb2b844383e20e6b58b73c8773a90e0139c69c506d983ea64fe2cf9972070
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FfVdmJGHMF
' 0018     20 LABEL : Cell Value, String Constant - AlJFd len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E166 
' 0018     24 LABEL : Cell Value, String Constant - CuoJkOKUE len=0 
' 0018     26 LABEL : Cell Value, String Constant - CxKxRBAwuiX len=0 
' 0018     21 LABEL : Cell Value, String Constant - ECPeKU len=0 
' 0018     25 LABEL : Cell Value, String Constant - gpfiDuEANA len=0 
' 0018     20 LABEL : Cell Value, String Constant - HayWE len=0 
' 0018     26 LABEL : Cell Value, String Constant - HbwCiGTbgDb len=0 
' 0018     22 LABEL : Cell Value, String Constant - hgssPlq len=0 
' 0018     27 LABEL : Cell Value, String Constant - KhYHAKrDFKaN len=0 
' 0018     20 LABEL : Cell Value, String Constant - LonIM len=0 
' 0018     23 LABEL : Cell Value, String Constant - NrtNencr len=0 
' 0018     21 LABEL : Cell Value, String Constant - olwPbF len=0 
' 0018     24 LABEL : Cell Value, String Constant - QRDIJtOJC len=0 
' 0018     25 LABEL : Cell Value, String Constant - qsiNOZWhxM len=0 
' 0018     22 LABEL : Cell Value, String Constant - rJspYwp len=0 
' 0018     20 LABEL : Cell Value, String Constant - WkxkI len=0 
' 0018     22 LABEL : Cell Value, String Constant - Xipzzbr len=0 
' 0018     23 LABEL : Cell Value, String Constant - xKQAECPb len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZJyDJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - zslWFC 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
' 00fd     10 LABELSST :
... (truncated)

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