Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e6c07c90dac1bc41…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:35 Authoring application: Microsoft Excel First seen: 2021-10-11
MD5: 63ee362c9251e2171f1d338a48c7fc11 SHA-1: 7325a4fa9ed1c8af3f51a198f99c3250fb833826 SHA-256: e6c07c90dac1bc413a2e2a3fb52537badb47848c18e5c9a4693f153681413008
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 finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. This points to a macro-based downloader or dropper, aiming to execute 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) 6612 bytes
SHA-256: 7ef8fc825cddcb3dd7bae8bff4bd2f82e8641c2da71a7741301d5226c5d81592
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Rbps
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F159 
' 0018     20 LABEL : Cell Value, String Constant - BWaWc len=0 
' 0018     27 LABEL : Cell Value, String Constant - bZsrVmVmFIye len=0 
' 0018     21 LABEL : Cell Value, String Constant - dKjVge len=0 
' 0018     21 LABEL : Cell Value, String Constant - fkMDHm len=0 
' 0018     23 LABEL : Cell Value, String Constant - gByztHwb len=0 
' 0018     25 LABEL : Cell Value, String Constant - GJAkRfBGfh len=0 
' 0018     21 LABEL : Cell Value, String Constant - HjRVqV len=0 
' 0018     21 LABEL : Cell Value, String Constant - jqUFyg len=0 
' 0018     22 LABEL : Cell Value, String Constant - nVMNUJr len=0 
' 0018     26 LABEL : Cell Value, String Constant - OUzNzvRaRoG len=0 
' 0018     26 LABEL : Cell Value, String Constant - pPqyzxcSlUq len=0 
' 0018     21 LABEL : Cell Value, String Constant - qdKUYD len=0 
' 0018     25 LABEL : Cell Value, String Constant - RZbEBqLbTF len=0 
' 0018     25 LABEL : Cell Value, String Constant - tDhRHvBpAE len=0 
' 0018     22 LABEL : Cell Value, String Constant - tsrUHVN len=0 
' 0018     24 LABEL : Cell Value, String Constant - WfQzFEJzl len=0 
' 0018     20 LABEL : Cell Value, String Constant - wzfOv len=0 
' 0018     20 LABEL : Cell Value, String Constant - xRXuv len=0 
' 0018     23 LABEL : Cell Value, String Constant - yhWtAvsw len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZMiGBGyA 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     10 LABELSST : C
... (truncated)

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