Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d2d8f9baa5111289…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:26:41 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: 417b3da60b331bcebc0b6d4bac99cdd2 SHA-1: a3754076bdfa4e9a5fe2ca062ab77d01a72b44f1 SHA-256: d2d8f9baa5111289ca175c37cb1cb72af50925c27c58e6fc8516cb89f6a617e0
140 Risk Score

Malware Insights

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

The file is an Excel workbook containing Excel 4.0 macros, specifically an Auto_Open defined name, which is a known method for executing malicious code. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands or download further payloads. No specific family could be identified, but the technique is common 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) 6688 bytes
SHA-256: e4567df8ff9710b3b9a0f7fe1aea5df39cbf2f8f3c91b79596d5397808ed197e
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 -  bCNCbaaOhwX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B195 
' 0018     21 LABEL : Cell Value, String Constant - bVHvkP len=0 
' 0018     25 LABEL : Cell Value, String Constant - bWchMSmBdv len=0 
' 0018     24 LABEL : Cell Value, String Constant - cZCASzITv len=0 
' 0018     21 LABEL : Cell Value, String Constant - dJoAXc len=0 
' 0018     26 LABEL : Cell Value, String Constant - DSfMHogzBRy len=0 
' 0018     26 LABEL : Cell Value, String Constant - EegglXFprZV len=0 
' 0018     23 LABEL : Cell Value, String Constant - EmlJISNF len=0 
' 0018     27 LABEL : Cell Value, String Constant - fsqnfKObCVZD len=0 
' 0018     20 LABEL : Cell Value, String Constant - hUNlY len=0 
' 0018     25 LABEL : Cell Value, String Constant - jFDEXzNlFF len=0 
' 0018     26 LABEL : Cell Value, String Constant - MKeTuujgAMQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - mOlYesgB len=0 
' 0018     26 LABEL : Cell Value, String Constant - MrfKbyZEfFV len=0 
' 0018     24 LABEL : Cell Value, String Constant - PRHjRbVVh len=0 
' 0018     23 LABEL : Cell Value, String Constant - RKVjQnQs len=0 
' 0018     22 LABEL : Cell Value, String Constant - SksYCkq len=0 
' 0018     27 LABEL : Cell Value, String Constant - TZdumwGtDFkz len=0 
' 0018     25 LABEL : Cell Value, String Constant - UNWtlbiapF len=0 
' 0018     24 LABEL : Cell Value, String Constant - UWkqNPqqS len=0 
' 0018     23 LABEL : Cell Value, String Constant - WoPXPWvD 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
... (truncated)

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