Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e23310d88ab9f9a7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:34:11 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 80bbe62d4fee4272f54e48be1af6df22 SHA-1: f12b238e2e355b5c0d9b1abbe92f1eca77a4c5d1 SHA-256: e23310d88ab9f9a78953213e122905539f236a6022e8f9fd6aaaaf1bd382393a
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 a critical finding. This indicates the macro sheet is designed to automatically execute code upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is intended to execute a payload. While no specific URLs or hashes were extracted, the Auto_Open macro is a strong indicator of malicious intent, likely for downloading and executing a second-stage 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) 6433 bytes
SHA-256: d8e92036f8bcf6ddcccab0ccd74bca78e5180c8cc5bc0a8acfd881ee1baaf1c3
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SCELO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G171 
' 0018     26 LABEL : Cell Value, String Constant - BhIfPIaEwIX len=0 
' 0018     22 LABEL : Cell Value, String Constant - BTOKHcp len=0 
' 0018     21 LABEL : Cell Value, String Constant - BuBqRj len=0 
' 0018     22 LABEL : Cell Value, String Constant - cIvbPfL len=0 
' 0018     22 LABEL : Cell Value, String Constant - eNoIrHR len=0 
' 0018     21 LABEL : Cell Value, String Constant - gHYvOv len=0 
' 0018     27 LABEL : Cell Value, String Constant - ilpcQKorkpCz len=0 
' 0018     21 LABEL : Cell Value, String Constant - jKHpWE len=0 
' 0018     26 LABEL : Cell Value, String Constant - jZsTlZLxptn len=0 
' 0018     22 LABEL : Cell Value, String Constant - LFicLuM len=0 
' 0018     24 LABEL : Cell Value, String Constant - onGYhylab len=0 
' 0018     27 LABEL : Cell Value, String Constant - oPoqKsgWaFcp len=0 
' 0018     22 LABEL : Cell Value, String Constant - pHGRoCw len=0 
' 0018     23 LABEL : Cell Value, String Constant - QvnsibHc len=0 
' 0018     25 LABEL : Cell Value, String Constant - RfIufQvSZO len=0 
' 0018     22 LABEL : Cell Value, String Constant - RSczRLy len=0 
' 0018     21 LABEL : Cell Value, String Constant - tGUkFJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - ugqmdt len=0 
' 0018     21 LABEL : Cell Value, String Constant - uWhnaL len=0 
' 0018     27 LABEL : Cell Value, String Constant - VypUhjswgAMb 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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