Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 956955eb0a027aaa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:27:53 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 4dab9b15109910ba645806161c4f6b26 SHA-1: af8ae6252b7d7870fbab0d7de773bef2ce1bdbe0 SHA-256: 956955eb0a027aaa9a2315b98ce56bffdfcaed7a3e30cd2d6e263cced7c3648f
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 critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely leading to further exploitation or payload delivery. No specific family could be identified from the available evidence.

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) 6509 bytes
SHA-256: 85baf39cba1bff2cd0bb03551fe2e3970997655eda6263fdbaa6a299c9dbf649
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 -  FbSNzep
' 0018     26 LABEL : Cell Value, String Constant - aDfaQwsAXEd len=0 
' 0018     20 LABEL : Cell Value, String Constant - AoKFK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H136 
' 0018     23 LABEL : Cell Value, String Constant - dLWCdXfp len=0 
' 0018     23 LABEL : Cell Value, String Constant - ejmSBoRH len=0 
' 0018     23 LABEL : Cell Value, String Constant - ElHphUan len=0 
' 0018     22 LABEL : Cell Value, String Constant - fIDPhpR len=0 
' 0018     27 LABEL : Cell Value, String Constant - GSRyqdXcUUcH len=0 
' 0018     26 LABEL : Cell Value, String Constant - hLraLMYKTYm len=0 
' 0018     20 LABEL : Cell Value, String Constant - JjPhY len=0 
' 0018     26 LABEL : Cell Value, String Constant - LMhojfcrhLV len=0 
' 0018     24 LABEL : Cell Value, String Constant - mIHMgcfMK len=0 
' 0018     22 LABEL : Cell Value, String Constant - QPdClfl len=0 
' 0018     27 LABEL : Cell Value, String Constant - qwLdVMEKLKSr len=0 
' 0018     26 LABEL : Cell Value, String Constant - rJGRHWnwucd len=0 
' 0018     25 LABEL : Cell Value, String Constant - RTGBPNPRfo len=0 
' 0018     20 LABEL : Cell Value, String Constant - SXnTt len=0 
' 0018     22 LABEL : Cell Value, String Constant - TPNajUw len=0 
' 0018     21 LABEL : Cell Value, String Constant - VImDpd len=0 
' 0018     25 LABEL : Cell Value, String Constant - XzGqmuAIcx len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZzbshzA 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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