Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7e714ad7f4a5f16…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:57 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: c23a7c7da13f540ac5c0c8ab70869459 SHA-1: c2642fc6ae61808b3779d224c04ca47d85c3c460 SHA-256: e7e714ad7f4a5f16c4b837c1ee981734616371ec50581f12e3361930d9ee4f02
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 entry, which is a known method for executing malicious code. The macro sheet contains a reference to 'Auto_Open', suggesting it will run automatically when the workbook is opened. The presence of dangerous formula APIs like RUN further confirms its malicious intent, likely to download and execute a second-stage payload.

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) 6861 bytes
SHA-256: 80fcfb9a42bf657d3d339e3e86f25bf5bea15ce81e8edda518f758523d2af7df
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UngKSuuIGO
' 0018     27 LABEL : Cell Value, String Constant - arYftCdypPhX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C153 
' 0018     22 LABEL : Cell Value, String Constant - DYBORFU len=0 
' 0018     20 LABEL : Cell Value, String Constant - GhwLo len=0 
' 0018     26 LABEL : Cell Value, String Constant - HepYKOOJRHF len=0 
' 0018     25 LABEL : Cell Value, String Constant - HJfgEHmfXs len=0 
' 0018     26 LABEL : Cell Value, String Constant - hZjobXZfsHL len=0 
' 0018     27 LABEL : Cell Value, String Constant - IzubjwxMerTu len=0 
' 0018     26 LABEL : Cell Value, String Constant - JTJKmLOibLz len=0 
' 0018     27 LABEL : Cell Value, String Constant - KZowxCtmtQSP len=0 
' 0018     22 LABEL : Cell Value, String Constant - lzowHBg len=0 
' 0018     26 LABEL : Cell Value, String Constant - ohxmLIRnhzE len=0 
' 0018     23 LABEL : Cell Value, String Constant - qOzoRzpl len=0 
' 0018     23 LABEL : Cell Value, String Constant - rbDoNaqQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - RoRtbLQI len=0 
' 0018     26 LABEL : Cell Value, String Constant - sHSCbnIWqRO len=0 
' 0018     21 LABEL : Cell Value, String Constant - VSefrj len=0 
' 0018     25 LABEL : Cell Value, String Constant - weaaTPCcjd len=0 
' 0018     20 LABEL : Cell Value, String Constant - zgaex len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZRyQHNg len=0 
' 0018     21 LABEL : Cell Value, String Constant - ztEzHm 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/ SS
... (truncated)

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