Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5298f7f031783b8f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:40 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 856c7afa042905a0e56599b26af944b4 SHA-1: de7b7b9666bf38d132a067d75c429ca5f8242d8a SHA-256: 5298f7f031783b8f9e603c5e172939f70aba5bf0ff31a3742f1c9f2411f9b9cf
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 a known method for executing arbitrary commands. The `RUN` function was identified as a dangerous API, suggesting the macro is designed to execute a payload. No specific family could be identified, but the technique is commonly used 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) 6821 bytes
SHA-256: 450f12a70ded4499d7f5e9776157ac052ce93d7b053a19a8c48233277c5854cc
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 -  GciVtWiLO
' 0018     20 LABEL : Cell Value, String Constant - AiNwC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D177 
' 0018     22 LABEL : Cell Value, String Constant - CKDMuMy len=0 
' 0018     26 LABEL : Cell Value, String Constant - cSzPEbWoBfi len=0 
' 0018     23 LABEL : Cell Value, String Constant - cuMWgaqq len=0 
' 0018     27 LABEL : Cell Value, String Constant - CwjSIkukGynk len=0 
' 0018     20 LABEL : Cell Value, String Constant - DrVCe len=0 
' 0018     24 LABEL : Cell Value, String Constant - ejDEJXvES len=0 
' 0018     27 LABEL : Cell Value, String Constant - HhfKqWOtwcqM len=0 
' 0018     21 LABEL : Cell Value, String Constant - IfWKJp len=0 
' 0018     26 LABEL : Cell Value, String Constant - iXaFxDHMcZu len=0 
' 0018     20 LABEL : Cell Value, String Constant - jFvVk len=0 
' 0018     22 LABEL : Cell Value, String Constant - JUfUGvi len=0 
' 0018     22 LABEL : Cell Value, String Constant - JxIFPcO len=0 
' 0018     27 LABEL : Cell Value, String Constant - JYrAqLcKcons len=0 
' 0018     26 LABEL : Cell Value, String Constant - JZavOHHyeIs len=0 
' 0018     25 LABEL : Cell Value, String Constant - kHuikkqsut len=0 
' 0018     26 LABEL : Cell Value, String Constant - LCIPlhAWRBX len=0 
' 0018     21 LABEL : Cell Value, String Constant - uRTyHJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - vyjEITRyup len=0 
' 0018     27 LABEL : Cell Value, String Constant - WfKVhWWAURdl 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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