Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2ccb2867777e445e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:11 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 96bc0c706da1ba3574d0ef2e0d4cf4a8 SHA-1: 167ce456430f6641ce034b89b85819acd661cacb SHA-256: 2ccb2867777e445e3bbd0fa041a9bb87cd1450755f76dbcf6dd6cfd35151d2de
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 flagged as critical due to the use of dangerous formula APIs. This indicates an attempt to automatically execute code upon opening the document. The macro sheet likely contains logic to download and execute a secondary payload, a common technique for initial execution.

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) 6757 bytes
SHA-256: ba4384ccc2fd089f818cc7ac5321483822f93977ba7c4ccaae9cb3b022715422
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 -  NGXNcih
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I149 
' 0018     21 LABEL : Cell Value, String Constant - AXRcos len=0 
' 0018     23 LABEL : Cell Value, String Constant - DDDoANYU len=0 
' 0018     24 LABEL : Cell Value, String Constant - FmVLMSqeT len=0 
' 0018     21 LABEL : Cell Value, String Constant - hphEhD len=0 
' 0018     27 LABEL : Cell Value, String Constant - IfoUMWXwMOzO len=0 
' 0018     23 LABEL : Cell Value, String Constant - KVqxhXzO len=0 
' 0018     24 LABEL : Cell Value, String Constant - mfnFyBUie len=0 
' 0018     25 LABEL : Cell Value, String Constant - nzJYcgTXqQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - OjgwYkNcsCAu len=0 
' 0018     26 LABEL : Cell Value, String Constant - psdCTGRZkew len=0 
' 0018     22 LABEL : Cell Value, String Constant - QucJmXb len=0 
' 0018     24 LABEL : Cell Value, String Constant - RbnQRsPYP len=0 
' 0018     24 LABEL : Cell Value, String Constant - SkeNMhvFe len=0 
' 0018     22 LABEL : Cell Value, String Constant - SVPucGY len=0 
' 0018     23 LABEL : Cell Value, String Constant - UFxIUtea len=0 
' 0018     22 LABEL : Cell Value, String Constant - UOUiNhG len=0 
' 0018     21 LABEL : Cell Value, String Constant - XHyoGZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - xRowh len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZpKquHb len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZQJEu 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 LABE
... (truncated)

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