Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7f7a22b2125a451b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:37:50 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 7d0e17fb5123f6c259366d4b9d7ade0f SHA-1: f7790617e9236d935a880737d00ecd6060b35875 SHA-256: 7f7a22b2125a451b77fe19fba8e4cfa521a2010e7b23fecdb8e263e29500fc54
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open defined name, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains dangerous formula APIs, suggesting it is designed to run 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) 6783 bytes
SHA-256: ff887114c09653f371ff58e4ac6977e8f37ccbdc90ac3ebc8fb1a09affc97188
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WGZaGwq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E132 
' 0018     22 LABEL : Cell Value, String Constant - AYpYEED len=0 
' 0018     24 LABEL : Cell Value, String Constant - AYQfMcCYz len=0 
' 0018     24 LABEL : Cell Value, String Constant - cTTBycoir len=0 
' 0018     21 LABEL : Cell Value, String Constant - dfsbpv len=0 
' 0018     27 LABEL : Cell Value, String Constant - dWNltluLqJIN len=0 
' 0018     26 LABEL : Cell Value, String Constant - ekCrrYMmOOO len=0 
' 0018     25 LABEL : Cell Value, String Constant - ftHQUNYpzK len=0 
' 0018     21 LABEL : Cell Value, String Constant - fwxCgD len=0 
' 0018     25 LABEL : Cell Value, String Constant - iuiJUymYjr len=0 
' 0018     21 LABEL : Cell Value, String Constant - KpdkIA len=0 
' 0018     26 LABEL : Cell Value, String Constant - lHLYJVYLuzC len=0 
' 0018     25 LABEL : Cell Value, String Constant - LUFkyLMqAJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - MnFLLYL len=0 
' 0018     26 LABEL : Cell Value, String Constant - nLcouyUXBfk len=0 
' 0018     24 LABEL : Cell Value, String Constant - PQdAujekb len=0 
' 0018     22 LABEL : Cell Value, String Constant - rDkNLiV len=0 
' 0018     27 LABEL : Cell Value, String Constant - rJqWGBynZjne len=0 
' 0018     24 LABEL : Cell Value, String Constant - RTqMYquEH len=0 
' 0018     27 LABEL : Cell Value, String Constant - WmlHszxjuYJs len=0 
' 0018     20 LABEL : Cell Value, String Constant - ykQYs 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

... (truncated)

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