Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9270954409e194be…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:22 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 1cd1fb0f84a41f634b2856f87c878c2c SHA-1: 71b335bfc4f4aeb291a7181e4ecd1810177512ee SHA-256: 9270954409e194be3701a4894799717c1a0dcdbb49ebc6278b0ff4d2be8abbe8
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-enabled workbook. Static analysis detected an Auto_Open defined name, indicating that macros will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a secondary payload. No specific family could be identified.

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) 6637 bytes
SHA-256: dad8da5909ccba7dc3d5656efd710fe952e069f34fc4e76657b56e13bb13cfd4
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 -  ZuQYD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B182 
' 0018     23 LABEL : Cell Value, String Constant - bhMfTwqg len=0 
' 0018     25 LABEL : Cell Value, String Constant - dzRmayCrUz len=0 
' 0018     21 LABEL : Cell Value, String Constant - FCHYCt len=0 
' 0018     27 LABEL : Cell Value, String Constant - fjquvJsQviCY len=0 
' 0018     24 LABEL : Cell Value, String Constant - fYOZSnqGk len=0 
' 0018     24 LABEL : Cell Value, String Constant - GMfbCndBb len=0 
' 0018     25 LABEL : Cell Value, String Constant - itzbnQBjAn len=0 
' 0018     23 LABEL : Cell Value, String Constant - jmJFVfEE len=0 
' 0018     24 LABEL : Cell Value, String Constant - JpcQNSKCg len=0 
' 0018     20 LABEL : Cell Value, String Constant - JtJOU len=0 
' 0018     21 LABEL : Cell Value, String Constant - KsiZKU len=0 
' 0018     21 LABEL : Cell Value, String Constant - KvZrEO len=0 
' 0018     27 LABEL : Cell Value, String Constant - OILUEBwuPSap len=0 
' 0018     26 LABEL : Cell Value, String Constant - rRjKEZkNMjH len=0 
' 0018     27 LABEL : Cell Value, String Constant - rukKsTiTkjtI len=0 
' 0018     25 LABEL : Cell Value, String Constant - SpcBCeOyvV len=0 
' 0018     26 LABEL : Cell Value, String Constant - tpZSreSHaqC len=0 
' 0018     21 LABEL : Cell Value, String Constant - wAiUid len=0 
' 0018     20 LABEL : Cell Value, String Constant - xWQJX len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZiUKe 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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