Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6b035f625dacaf5f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:47 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: b14e4c6bb2941771ce5b56430ed9fa56 SHA-1: 344eb9482354a47e8296d510c5567720e1440b93 SHA-256: 6b035f625dacaf5f1f5264beec02396108d3bd7e74a0ac8787bf109da8469827
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 potential malicious execution. The presence of dangerous formula APIs like 'RUN' suggests the macro is designed to execute arbitrary commands. This pattern is commonly used to download and execute further stages of malware.

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) 6706 bytes
SHA-256: 236a748fe69a6d6a29c6a452259e69168d6bf8daca8219abe593e7639b8dea50
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 -  BnlDK
' 0018     26 LABEL : Cell Value, String Constant - akbyHVYSTnL len=0 
' 0018     24 LABEL : Cell Value, String Constant - AUrVFXcPX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G147 
' 0018     27 LABEL : Cell Value, String Constant - csyrhZAKSPwV len=0 
' 0018     27 LABEL : Cell Value, String Constant - EYzIZteLTspr len=0 
' 0018     23 LABEL : Cell Value, String Constant - JjmDNGXT len=0 
' 0018     26 LABEL : Cell Value, String Constant - kqTFuqcjXsP len=0 
' 0018     22 LABEL : Cell Value, String Constant - LhQZOaP len=0 
' 0018     24 LABEL : Cell Value, String Constant - lloAhgwZH len=0 
' 0018     25 LABEL : Cell Value, String Constant - LqTiOVaeGB len=0 
' 0018     25 LABEL : Cell Value, String Constant - LtpoYpLZGN len=0 
' 0018     22 LABEL : Cell Value, String Constant - mnznQkP len=0 
' 0018     27 LABEL : Cell Value, String Constant - OteKaceEDjXb len=0 
' 0018     21 LABEL : Cell Value, String Constant - qnOIjo len=0 
' 0018     23 LABEL : Cell Value, String Constant - quMQKohb len=0 
' 0018     26 LABEL : Cell Value, String Constant - rhfsGkRXvia len=0 
' 0018     21 LABEL : Cell Value, String Constant - rNilLG len=0 
' 0018     20 LABEL : Cell Value, String Constant - TavUK len=0 
' 0018     20 LABEL : Cell Value, String Constant - TsGZD len=0 
' 0018     23 LABEL : Cell Value, String Constant - VHnAOqmo len=0 
' 0018     27 LABEL : Cell Value, String Constant - VnYPwxunBHqL 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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