Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 101262bc62e02287…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:40 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 1937ea85e54999905a3121c48a2c3d69 SHA-1: fe7a798041907e335556bec5e7bf74c10e091297 SHA-256: 101262bc62e02287b80248e3f55ccc2bbfacd3e4ad6bc594d354323ab02b784d
140 Risk Score

Malware Insights

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

The 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 commands. This strongly suggests the file is a downloader or dropper for a second-stage payload.

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) 6487 bytes
SHA-256: 883479d912ba030ac101aebaffef10bd8f42a0c7c889a8ba6ef7c4d7d586e383
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tObFR
' 0018     23 LABEL : Cell Value, String Constant - AkrzgdMs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B170 
' 0018     23 LABEL : Cell Value, String Constant - bkrzZOmL len=0 
' 0018     21 LABEL : Cell Value, String Constant - blKvLP len=0 
' 0018     27 LABEL : Cell Value, String Constant - DOzdULLmfMgd len=0 
' 0018     22 LABEL : Cell Value, String Constant - DsBUObP len=0 
' 0018     24 LABEL : Cell Value, String Constant - eycfMGBtk len=0 
' 0018     20 LABEL : Cell Value, String Constant - FizYa len=0 
' 0018     26 LABEL : Cell Value, String Constant - hojeuJmUqjx len=0 
' 0018     25 LABEL : Cell Value, String Constant - IxDKwwnIKL len=0 
' 0018     23 LABEL : Cell Value, String Constant - jIErTxyP len=0 
' 0018     20 LABEL : Cell Value, String Constant - LdNVU len=0 
' 0018     24 LABEL : Cell Value, String Constant - LNEembAWA len=0 
' 0018     23 LABEL : Cell Value, String Constant - qTOvykPE len=0 
' 0018     26 LABEL : Cell Value, String Constant - QYDPpUhnmGU len=0 
' 0018     27 LABEL : Cell Value, String Constant - ritlgfkjGBGP len=0 
' 0018     25 LABEL : Cell Value, String Constant - tBAocangjY len=0 
' 0018     27 LABEL : Cell Value, String Constant - UGCfjAeViDao len=0 
' 0018     21 LABEL : Cell Value, String Constant - upgpyA len=0 
' 0018     22 LABEL : Cell Value, String Constant - xxXmfwF len=0 
' 0018     23 LABEL : Cell Value, String Constant - YIxiudIe 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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