Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8e9a497e4f0be8e6…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:41:07 Authoring application: Microsoft Excel First seen: 2021-10-05
MD5: 984f3f94ec87571743a3401b5b738600 SHA-1: 8993fcf4403fb44facf1208909bb23d2fe4dd12e SHA-256: 8e9a497e4f0be8e69a5337f55771ff98841cd7b02b3edad7f34d31a0cafa936e
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions. This indicates an attempt to execute arbitrary code upon opening the document, likely to download and run a secondary payload. The presence of the Auto_Open entry and the use of risky functions are strong indicators of malicious intent.

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) 6677 bytes
SHA-256: b357d08a72a252ff7f1d2faae9407c4c32221490d28f812fa958be8c995f80f7
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 -  UkTIIyv
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E140 
' 0018     24 LABEL : Cell Value, String Constant - axUlhijdj len=0 
' 0018     25 LABEL : Cell Value, String Constant - ClvGpHvpYC len=0 
' 0018     22 LABEL : Cell Value, String Constant - CntvkqC len=0 
' 0018     20 LABEL : Cell Value, String Constant - DWjBf len=0 
' 0018     26 LABEL : Cell Value, String Constant - EJXqaCYfqVd len=0 
' 0018     23 LABEL : Cell Value, String Constant - FJPZIhGy len=0 
' 0018     20 LABEL : Cell Value, String Constant - fQpBm len=0 
' 0018     25 LABEL : Cell Value, String Constant - iriWteKNmE len=0 
' 0018     20 LABEL : Cell Value, String Constant - iYLeG len=0 
' 0018     22 LABEL : Cell Value, String Constant - JYbBUOY len=0 
' 0018     26 LABEL : Cell Value, String Constant - kXqIqZpUuhh len=0 
' 0018     21 LABEL : Cell Value, String Constant - mxIKkO len=0 
' 0018     22 LABEL : Cell Value, String Constant - neoteQp len=0 
' 0018     27 LABEL : Cell Value, String Constant - ojOuGYvvUeNa len=0 
' 0018     21 LABEL : Cell Value, String Constant - QXWnzL len=0 
' 0018     24 LABEL : Cell Value, String Constant - rVdpFMjYC len=0 
' 0018     26 LABEL : Cell Value, String Constant - SQjNjDIgtjH len=0 
' 0018     21 LABEL : Cell Value, String Constant - ttmgfc len=0 
' 0018     21 LABEL : Cell Value, String Constant - vnwLbo len=0 
' 0018     26 LABEL : Cell Value, String Constant - XGzBlBoBJmy 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 LAB
... (truncated)

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