Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3eeb84e5eae0e4dc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:49 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: d370eea32815fd71ead4ff2caeda9d65 SHA-1: f5779eb126d5d4717210face378b591f0c6bdbf2 SHA-256: 3eeb84e5eae0e4dc2e1712c1232cd4c98c0da36a1ea450ba23f64e111dd162ae
140 Risk Score

Malware Insights

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

This Excel 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 further increases the risk. The macro sheet is designed to automatically execute code upon opening, likely to download and run 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) 6540 bytes
SHA-256: aaee0e28133b3c6f99a3d8bafe321c16e714bd7c345cbaa7dbe2d988bcd48697
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 -  UdPSC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E146 
' 0018     25 LABEL : Cell Value, String Constant - eeVwxDLley len=0 
' 0018     27 LABEL : Cell Value, String Constant - ETcirVZwrMbu len=0 
' 0018     22 LABEL : Cell Value, String Constant - eWhQcEU len=0 
' 0018     24 LABEL : Cell Value, String Constant - fLxumyTqA len=0 
' 0018     20 LABEL : Cell Value, String Constant - hZGKO len=0 
' 0018     26 LABEL : Cell Value, String Constant - IDCpLtVXiQY len=0 
' 0018     26 LABEL : Cell Value, String Constant - kOYdWnPNcuk len=0 
' 0018     27 LABEL : Cell Value, String Constant - mNOoXTecsTOa len=0 
' 0018     23 LABEL : Cell Value, String Constant - OFANJFAw len=0 
' 0018     24 LABEL : Cell Value, String Constant - oIGnfZuoI len=0 
' 0018     24 LABEL : Cell Value, String Constant - OkLwsseQM len=0 
' 0018     24 LABEL : Cell Value, String Constant - plDslyQvq len=0 
' 0018     20 LABEL : Cell Value, String Constant - pTABt len=0 
' 0018     21 LABEL : Cell Value, String Constant - QnYElz len=0 
' 0018     20 LABEL : Cell Value, String Constant - RIDmp len=0 
' 0018     20 LABEL : Cell Value, String Constant - uQccA len=0 
' 0018     26 LABEL : Cell Value, String Constant - uzzCejvRscM len=0 
' 0018     21 LABEL : Cell Value, String Constant - XcYRzI len=0 
' 0018     25 LABEL : Cell Value, String Constant - XHuOyCLsjl len=0 
' 0018     21 LABEL : Cell Value, String Constant - xssZRb 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 L
... (truncated)

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