Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0809af708cfb13b3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:15 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: dcedcce7c2a97e7ee34ae1ef2504e55c SHA-1: 39abbff072470fe08137bf76616b4e09982c11cd SHA-256: 0809af708cfb13b338d6ee606de270716efb478e0a45885b0b7c3d8b98bfd7ba
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. This indicates the macro sheet is designed to automatically execute code upon opening the workbook. The presence of dangerous formula APIs like RUN further confirms its malicious intent to execute arbitrary commands.

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) 6416 bytes
SHA-256: fd0745edc46bafd2e86da4b5e42b2807a182343f33af966a033e5a889e8632ab
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 -  YRB
' 0018     20 LABEL : Cell Value, String Constant - ATpmF len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I153 
' 0018     22 LABEL : Cell Value, String Constant - bPILIRl len=0 
' 0018     22 LABEL : Cell Value, String Constant - fEvoNak len=0 
' 0018     24 LABEL : Cell Value, String Constant - HGNKgGoqq len=0 
' 0018     24 LABEL : Cell Value, String Constant - keXNwAymx len=0 
' 0018     26 LABEL : Cell Value, String Constant - kUarDmbQING len=0 
' 0018     27 LABEL : Cell Value, String Constant - kUHBRgzzrWwB len=0 
' 0018     20 LABEL : Cell Value, String Constant - nqmpF len=0 
' 0018     21 LABEL : Cell Value, String Constant - NYDhQs len=0 
' 0018     23 LABEL : Cell Value, String Constant - OkeJMgKZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - okqDbSxDeKU len=0 
' 0018     25 LABEL : Cell Value, String Constant - oTIPTdMIFh len=0 
' 0018     24 LABEL : Cell Value, String Constant - RRqJZgbXj len=0 
' 0018     27 LABEL : Cell Value, String Constant - SVtkpCCOadlz len=0 
' 0018     22 LABEL : Cell Value, String Constant - uzQfYnO len=0 
' 0018     20 LABEL : Cell Value, String Constant - VLrJL len=0 
' 0018     22 LABEL : Cell Value, String Constant - WGaUtQz len=0 
' 0018     24 LABEL : Cell Value, String Constant - wVWzAnYss len=0 
' 0018     22 LABEL : Cell Value, String Constant - xmILvqd len=0 
' 0018     25 LABEL : Cell Value, String Constant - yFcShOJLFu 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 LAB
... (truncated)

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