Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 26c57d4fe636151a…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:20 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: a6b4af9202aaeda8f834ecb94e690e46 SHA-1: fe1b476b38d827dc04230f0287efbe6b86785079 SHA-256: 26c57d4fe636151ae2686aaccc785408c23980ada02244cc521fb99f9ffaa96d
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 function, which is a known method for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the XLM macro, suggesting an attempt to run arbitrary commands or download further payloads. The extensive obfuscated text in the document body likely contains further malicious content or 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) 6616 bytes
SHA-256: d7052e9f8fb1314a2af14f98adbc095b88ef0b726ff30914bc50c49403dd5135
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  clidWuXE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F161 
' 0018     20 LABEL : Cell Value, String Constant - BCdIW len=0 
' 0018     25 LABEL : Cell Value, String Constant - BDAMKFaLyU len=0 
' 0018     25 LABEL : Cell Value, String Constant - BFwlWkvzDa len=0 
' 0018     25 LABEL : Cell Value, String Constant - cUfSujficT len=0 
' 0018     20 LABEL : Cell Value, String Constant - DboZd len=0 
' 0018     24 LABEL : Cell Value, String Constant - ECDGJiNjm len=0 
' 0018     23 LABEL : Cell Value, String Constant - FRJlawgb len=0 
' 0018     27 LABEL : Cell Value, String Constant - ltkIWaSMZqhE len=0 
' 0018     24 LABEL : Cell Value, String Constant - lyrDriSyg len=0 
' 0018     26 LABEL : Cell Value, String Constant - mALUnLCeGSz len=0 
' 0018     22 LABEL : Cell Value, String Constant - NLjuLDK len=0 
' 0018     27 LABEL : Cell Value, String Constant - OEIUpGZalfnY len=0 
' 0018     22 LABEL : Cell Value, String Constant - paRcVdN len=0 
' 0018     25 LABEL : Cell Value, String Constant - QFZGrTAMsp len=0 
' 0018     20 LABEL : Cell Value, String Constant - QXfSW len=0 
' 0018     27 LABEL : Cell Value, String Constant - VbmcfPrDazOC len=0 
' 0018     21 LABEL : Cell Value, String Constant - vsScGD len=0 
' 0018     26 LABEL : Cell Value, String Constant - YiMBggQdaYf len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZbhaqWvCL len=0 
' 0018     24 LABEL : Cell Value, String Constant - zwnfvmYiH 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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