Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5360d6b0a9ad94ee…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:41 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 3d14a7bb10c26a27204c861251192765 SHA-1: a056ab578f9e047468e9553fb38e9855386972d6 SHA-256: 5360d6b0a9ad94eee96e45cd3262f8c42080e69c3aec8b6152f56347f59230a3
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute external commands or payloads. While no specific URLs or hashes were extracted, the primary function is to achieve arbitrary code 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) 6662 bytes
SHA-256: d3959b0d58ef52e4b96bd29b5bb607241771c966df9b10e54b5257dc4e9fefb6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RfShqe
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A128 
' 0018     24 LABEL : Cell Value, String Constant - BigiHBzpP len=0 
' 0018     23 LABEL : Cell Value, String Constant - biZVaHlv len=0 
' 0018     26 LABEL : Cell Value, String Constant - BnfsRvIqmTu len=0 
' 0018     21 LABEL : Cell Value, String Constant - cAetDZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - hIPjAIi len=0 
' 0018     25 LABEL : Cell Value, String Constant - ImajxameyM len=0 
' 0018     22 LABEL : Cell Value, String Constant - jnSapdX len=0 
' 0018     21 LABEL : Cell Value, String Constant - LgnuFE len=0 
' 0018     25 LABEL : Cell Value, String Constant - NxYwUXiwOd len=0 
' 0018     26 LABEL : Cell Value, String Constant - nYnQtzLbqud len=0 
' 0018     26 LABEL : Cell Value, String Constant - OCaFcboiEDZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - QNXEjKs len=0 
' 0018     25 LABEL : Cell Value, String Constant - SAAszOOLDg len=0 
' 0018     24 LABEL : Cell Value, String Constant - SLyYYgauY len=0 
' 0018     27 LABEL : Cell Value, String Constant - tNkzzDmUICIF len=0 
' 0018     26 LABEL : Cell Value, String Constant - tPtimgFdeaK len=0 
' 0018     26 LABEL : Cell Value, String Constant - TRDMqMVlfxm len=0 
' 0018     20 LABEL : Cell Value, String Constant - TseDQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - WSqhHhv len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZvgeYa 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
... (truncated)

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