Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ee83a6c67b306d5a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:21 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 6b74a575e48ab50af18b09c44a83867c SHA-1: f9aa2ade1635c173a8a773a469458f91c05743bd SHA-256: ee83a6c67b306d5a12074b926fe8fdf09e9136f229dcd4b513dfa50ca7ed4c50
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided macro listing, the Auto_Open function is a common technique for initial execution of malware.

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) 6557 bytes
SHA-256: 482894f03527b76aa99c61ca168cd10d7696c0697f734602da0a842d30e566e6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nFrmsdiD
' 0018     23 LABEL : Cell Value, String Constant - AdhPzRmX len=0 
' 0018     24 LABEL : Cell Value, String Constant - AruTXmMKh len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E150 
' 0018     22 LABEL : Cell Value, String Constant - dsoeLgU len=0 
' 0018     21 LABEL : Cell Value, String Constant - GWbjbk len=0 
' 0018     25 LABEL : Cell Value, String Constant - HTuvSfrnUN len=0 
' 0018     26 LABEL : Cell Value, String Constant - ICnaWkXbVEV len=0 
' 0018     22 LABEL : Cell Value, String Constant - idUsUEi len=0 
' 0018     26 LABEL : Cell Value, String Constant - jjczslvayaD len=0 
' 0018     27 LABEL : Cell Value, String Constant - jrThFgwPfxIZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - kNKPsDh len=0 
' 0018     24 LABEL : Cell Value, String Constant - kVcwSsHYC len=0 
' 0018     20 LABEL : Cell Value, String Constant - NRwgi len=0 
' 0018     20 LABEL : Cell Value, String Constant - nXkte len=0 
' 0018     20 LABEL : Cell Value, String Constant - OLDHe len=0 
' 0018     26 LABEL : Cell Value, String Constant - oRccJGNXUHz len=0 
' 0018     27 LABEL : Cell Value, String Constant - pOUfqUJVBRAy len=0 
' 0018     27 LABEL : Cell Value, String Constant - tycRmOitkqHM len=0 
' 0018     26 LABEL : Cell Value, String Constant - uwFZERDeBgH len=0 
' 0018     21 LABEL : Cell Value, String Constant - xfroVa len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZGoNwBFkgOJY 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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