Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6021723d4696bffd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:00 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 4a526478c18db3ea36a699180dfe3079 SHA-1: 4ab66db27adf4a641dd169795e319cfd7f1cb181 SHA-256: 6021723d4696bffdba20fde7530ba196dddbde5b9962f1dd68c3b382da1276fe
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 or download further payloads. Without a clear second-stage indicator, the exact payload remains unknown, but the execution vector is clear.

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) 6411 bytes
SHA-256: 0bb24ec100a19b0180a82faf49ada9153ec7fbf746c70c6f8546133f36fa9fed
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xQF
' 0018     25 LABEL : Cell Value, String Constant - apnzQhcmxL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B181 
' 0018     26 LABEL : Cell Value, String Constant - BkrhORMbiBj len=0 
' 0018     25 LABEL : Cell Value, String Constant - DElAkpkbnV len=0 
' 0018     24 LABEL : Cell Value, String Constant - dUppZkJWx len=0 
' 0018     26 LABEL : Cell Value, String Constant - EyTYDcPVDxb len=0 
' 0018     26 LABEL : Cell Value, String Constant - HwezHQfsols len=0 
' 0018     26 LABEL : Cell Value, String Constant - KBZnsceAkGs len=0 
' 0018     21 LABEL : Cell Value, String Constant - kflzqV len=0 
' 0018     23 LABEL : Cell Value, String Constant - KSnsQCpu len=0 
' 0018     26 LABEL : Cell Value, String Constant - LzLPPNYQCsp len=0 
' 0018     21 LABEL : Cell Value, String Constant - mMwsSL len=0 
' 0018     26 LABEL : Cell Value, String Constant - NmxXaFZDzFM len=0 
' 0018     27 LABEL : Cell Value, String Constant - qjPwjLqFhAZq len=0 
' 0018     20 LABEL : Cell Value, String Constant - SHSjY len=0 
' 0018     22 LABEL : Cell Value, String Constant - SjEaZpM len=0 
' 0018     23 LABEL : Cell Value, String Constant - uiPODopw len=0 
' 0018     22 LABEL : Cell Value, String Constant - vBBDsBI len=0 
' 0018     26 LABEL : Cell Value, String Constant - xgAQOFYaLtI len=0 
' 0018     26 LABEL : Cell Value, String Constant - xWhduFLDcds len=0 
' 0018     20 LABEL : Cell Value, String Constant - yfKHb 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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