Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eda5eefa79accfd4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:53 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 19c5a876b2e1e4f1477b5e2f5c78986c SHA-1: 4c432881a13485fa70665e696d07eba13e3958cb SHA-256: eda5eefa79accfd4a0d2182d6205241f74539baa593c583705567e91447ffe5a
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The macro sheet contains references to dangerous formula APIs, specifically 'RUN', suggesting it is designed to execute external commands or download payloads. No specific URLs or further executable code were extracted, but the presence of Auto_Open strongly implies a downloader or initial execution stage.

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) 6427 bytes
SHA-256: ebdfd02ba8334952ccba7d652f75845c820b89e4c1166236d6a6f9674ce550ab
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 -  raD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I187 
' 0018     21 LABEL : Cell Value, String Constant - aZtFpU len=0 
' 0018     27 LABEL : Cell Value, String Constant - bPVGgBgDZOLj len=0 
' 0018     20 LABEL : Cell Value, String Constant - cvjHn len=0 
' 0018     23 LABEL : Cell Value, String Constant - DbfHkmAN len=0 
' 0018     24 LABEL : Cell Value, String Constant - DtJFRCHnn len=0 
' 0018     20 LABEL : Cell Value, String Constant - EGBcd len=0 
' 0018     26 LABEL : Cell Value, String Constant - fdlkuFtNcNz len=0 
' 0018     27 LABEL : Cell Value, String Constant - FjyAMYsydbNJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - FmUGNP len=0 
' 0018     24 LABEL : Cell Value, String Constant - GRLbzfKRL len=0 
' 0018     20 LABEL : Cell Value, String Constant - iSgWv len=0 
' 0018     20 LABEL : Cell Value, String Constant - JoXbE len=0 
' 0018     22 LABEL : Cell Value, String Constant - lnBJmdW len=0 
' 0018     24 LABEL : Cell Value, String Constant - OGdBvgbIy len=0 
' 0018     22 LABEL : Cell Value, String Constant - OOYMUpu len=0 
' 0018     25 LABEL : Cell Value, String Constant - OqnenZfUJf len=0 
' 0018     21 LABEL : Cell Value, String Constant - QKXXNo len=0 
' 0018     21 LABEL : Cell Value, String Constant - qOmwVb len=0 
' 0018     27 LABEL : Cell Value, String Constant - rcvcYCZCWiGC len=0 
' 0018     27 LABEL : Cell Value, String Constant - XIeitMZFWEGZ 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 LABELSS
... (truncated)

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