Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62e0ed14b62633f3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:47 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 7842fd206a292dd2cfdbc4f962323046 SHA-1: de564b2daa7a45b7fb56574ffae40768e24012ce SHA-256: 62e0ed14b62633f34b36c2ee5b8f3b8175c11b99d61d584986c5fe4f9e9d111d
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it is designed to run arbitrary commands. No specific family could be identified, but the technique points to a macro-based execution of a payload.

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) 6547 bytes
SHA-256: 8aca28005ab1324d49e6badff74c282d4665bb86e81f18ffa49f2d7bb557ca86
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 -  dVHkQbjb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G154 
' 0018     21 LABEL : Cell Value, String Constant - bHgWuD len=0 
' 0018     26 LABEL : Cell Value, String Constant - BKGHMCgHdZY len=0 
' 0018     21 LABEL : Cell Value, String Constant - BliGZK len=0 
' 0018     27 LABEL : Cell Value, String Constant - etrErLZOWAYS len=0 
' 0018     21 LABEL : Cell Value, String Constant - gScWqQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - HrYCuxPBe len=0 
' 0018     26 LABEL : Cell Value, String Constant - HYOviDhDtOu len=0 
' 0018     27 LABEL : Cell Value, String Constant - iJlnMqqoMKDF len=0 
' 0018     24 LABEL : Cell Value, String Constant - kciEvqqBb len=0 
' 0018     24 LABEL : Cell Value, String Constant - lLeGUNBhm len=0 
' 0018     27 LABEL : Cell Value, String Constant - LvgROtxIKoMa len=0 
' 0018     22 LABEL : Cell Value, String Constant - NCjTqqa len=0 
' 0018     20 LABEL : Cell Value, String Constant - NLqsv len=0 
' 0018     21 LABEL : Cell Value, String Constant - NrBquk len=0 
' 0018     22 LABEL : Cell Value, String Constant - RgqOkRf len=0 
' 0018     23 LABEL : Cell Value, String Constant - RRKUvsdg len=0 
' 0018     21 LABEL : Cell Value, String Constant - tjeETd len=0 
' 0018     21 LABEL : Cell Value, String Constant - xjXQgy len=0 
' 0018     25 LABEL : Cell Value, String Constant - YdbwESCFWE len=0 
' 0018     26 LABEL : Cell Value, String Constant - YxqjyapHcmL 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   
... (truncated)

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