Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4ee85086115b95a2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:51 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: a32018c6cbff8625ad51d47de3da3896 SHA-1: cc5c9f531f558fc86015bfca952ce9404b468354 SHA-256: 4ee85086115b95a2620de935939e16563eac0cb19e63c8547e42fce46c90ed23
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 further suggests malicious intent, likely to download and execute a secondary 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) 6550 bytes
SHA-256: 409e66ed6d632b239db230a8db7518407942b8bf793bf299c3ee9522615d8b8a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Dke
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B142 
' 0018     20 LABEL : Cell Value, String Constant - bQCgk len=0 
' 0018     24 LABEL : Cell Value, String Constant - BzoZeDULS len=0 
' 0018     20 LABEL : Cell Value, String Constant - cAkqB len=0 
' 0018     25 LABEL : Cell Value, String Constant - CQeIPfOaQK len=0 
' 0018     20 LABEL : Cell Value, String Constant - dElvF len=0 
' 0018     25 LABEL : Cell Value, String Constant - HKhUqkiDCz len=0 
' 0018     26 LABEL : Cell Value, String Constant - hSCZrXXhDrO len=0 
' 0018     27 LABEL : Cell Value, String Constant - IfBhbIqHvGsp len=0 
' 0018     25 LABEL : Cell Value, String Constant - jxdsaWeJlR len=0 
' 0018     27 LABEL : Cell Value, String Constant - KLwbmHOyCfwO len=0 
' 0018     24 LABEL : Cell Value, String Constant - kzRmERRDG len=0 
' 0018     25 LABEL : Cell Value, String Constant - nZYuClomes len=0 
' 0018     23 LABEL : Cell Value, String Constant - TxWMwoDJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - UfHfAMKWg len=0 
' 0018     20 LABEL : Cell Value, String Constant - umeXu len=0 
' 0018     27 LABEL : Cell Value, String Constant - uphYWIwviwOP len=0 
' 0018     22 LABEL : Cell Value, String Constant - vufSTAu len=0 
' 0018     21 LABEL : Cell Value, String Constant - WTdmWm len=0 
' 0018     23 LABEL : Cell Value, String Constant - xRphioRn len=0 
' 0018     24 LABEL : Cell Value, String Constant - YvPTHWypv 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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