Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6f8e9eccf6e18c65…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:45 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 1381d56025d2639e37f15bb22d7fb216 SHA-1: 76ddb54202c5f6dfedc5c6622ade84173932d21d SHA-256: 6f8e9eccf6e18c6578b9d4b0abba1351cc934f3bd3352f34d6b7209cc15ac510
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 within the macro sheet further supports this. The macro sheet itself contains a large amount of obfuscated data, suggesting it is designed to perform actions beyond simple calculations.

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) 6682 bytes
SHA-256: 9c45da899865a90d7946c32a1177c82228bb79fe7465faaeb17c499bd1f50eaf
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  smvLkN
' 0018     20 LABEL : Cell Value, String Constant - aggkx len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A171 
' 0018     24 LABEL : Cell Value, String Constant - BiCkGYVCA len=0 
' 0018     24 LABEL : Cell Value, String Constant - dMxbpRwOo len=0 
' 0018     21 LABEL : Cell Value, String Constant - dOThca len=0 
' 0018     25 LABEL : Cell Value, String Constant - eazpeYDxUm len=0 
' 0018     22 LABEL : Cell Value, String Constant - EpeRMUf len=0 
' 0018     21 LABEL : Cell Value, String Constant - EVWmXI len=0 
' 0018     20 LABEL : Cell Value, String Constant - HmPHx len=0 
' 0018     21 LABEL : Cell Value, String Constant - JhQtpq len=0 
' 0018     21 LABEL : Cell Value, String Constant - jjuCjD len=0 
' 0018     27 LABEL : Cell Value, String Constant - KrCCnKREbQeJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - lEsNw len=0 
' 0018     25 LABEL : Cell Value, String Constant - lNwreYVITK len=0 
' 0018     23 LABEL : Cell Value, String Constant - OlPerDbb len=0 
' 0018     21 LABEL : Cell Value, String Constant - pABAWQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - qNnzqueyZK len=0 
' 0018     21 LABEL : Cell Value, String Constant - ulWgsK len=0 
' 0018     21 LABEL : Cell Value, String Constant - XfUYLJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - zGogpEQTq len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZrZRKWYyF 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 LABELSST : Cell 
... (truncated)

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