Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e981ddb03c7a970…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:05 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 3b6125519f71973abcf49fa9932d7ff1 SHA-1: 7043d205ca212141dd141f2ba5676e370e105655 SHA-256: 7e981ddb03c7a97040f1798659a5b22275031ff8468b5527ed598a5f14d66a78
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating automatic execution upon opening. The critical heuristic 'OLE_XLM_DANGEROUS_FN' specifically flags the use of dangerous formula APIs like RUN within the Auto_Open macro, which is commonly used to download and execute malicious payloads. The presence of the Auto_Open entry is the primary IOC.

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) 6468 bytes
SHA-256: a4c4ab2b8b05b900fb744f3627f981b586c87216d807a5a961afe6b17b67e9de
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eWfroGG
' 0018     21 LABEL : Cell Value, String Constant - AiTyuK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E190 
' 0018     24 LABEL : Cell Value, String Constant - AxDzprdTZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - BCNPSdK len=0 
' 0018     23 LABEL : Cell Value, String Constant - BGEJQCtY len=0 
' 0018     25 LABEL : Cell Value, String Constant - DrahkIjrqG len=0 
' 0018     20 LABEL : Cell Value, String Constant - ebaAS len=0 
' 0018     24 LABEL : Cell Value, String Constant - ezNumgtJb len=0 
' 0018     23 LABEL : Cell Value, String Constant - FvVWWAaj len=0 
' 0018     24 LABEL : Cell Value, String Constant - hXmfiEsnS len=0 
' 0018     20 LABEL : Cell Value, String Constant - jedFp len=0 
' 0018     24 LABEL : Cell Value, String Constant - MKFGUUvpW len=0 
' 0018     21 LABEL : Cell Value, String Constant - mWpTQj len=0 
' 0018     22 LABEL : Cell Value, String Constant - NlHoxRz len=0 
' 0018     27 LABEL : Cell Value, String Constant - OssZwUgFlmwa len=0 
' 0018     24 LABEL : Cell Value, String Constant - QIMDRDptF len=0 
' 0018     24 LABEL : Cell Value, String Constant - qyvLorjmW len=0 
' 0018     21 LABEL : Cell Value, String Constant - tVbWiD len=0 
' 0018     22 LABEL : Cell Value, String Constant - VRFNtVl len=0 
' 0018     25 LABEL : Cell Value, String Constant - yCDMjWddWA len=0 
' 0018     20 LABEL : Cell Value, String Constant - YnPEz 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 
... (truncated)

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