Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa54053f15dee8a5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:50 Authoring application: Microsoft Excel First seen: 2021-10-01
MD5: 9540b20cb255ccd26490e933fe8f8b05 SHA-1: 4d5d724a4771959107c6c82ee26dc394f3c0469a SHA-256: aa54053f15dee8a532d13c2a664bf55a9fdf1a1254b5640fde7f7c2c8731aef0
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 indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This is a common technique for downloading and executing further malicious content.

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) 6428 bytes
SHA-256: feb2067fc6578ac80deb90aabe2bb0fbd21442e4f3123aa388d0d2447488966a
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 -  lztoh
' 0018     27 LABEL : Cell Value, String Constant - amzYYyZVSAkj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E177 
' 0018     22 LABEL : Cell Value, String Constant - aXAErdY len=0 
' 0018     22 LABEL : Cell Value, String Constant - DKIiPwP len=0 
' 0018     26 LABEL : Cell Value, String Constant - DPTFdEChHHj len=0 
' 0018     22 LABEL : Cell Value, String Constant - IUehIDJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - krOdd len=0 
' 0018     24 LABEL : Cell Value, String Constant - lcfwHPgIM len=0 
' 0018     25 LABEL : Cell Value, String Constant - mFNnpxdXHO len=0 
' 0018     22 LABEL : Cell Value, String Constant - mOlFsHC len=0 
' 0018     26 LABEL : Cell Value, String Constant - PGKBrUENhEH len=0 
' 0018     25 LABEL : Cell Value, String Constant - PWQXltGQJO len=0 
' 0018     22 LABEL : Cell Value, String Constant - QYGsAiS len=0 
' 0018     26 LABEL : Cell Value, String Constant - RiLaUKNOtzA len=0 
' 0018     21 LABEL : Cell Value, String Constant - rsfanc len=0 
' 0018     23 LABEL : Cell Value, String Constant - SbuxBBHm len=0 
' 0018     22 LABEL : Cell Value, String Constant - tASOFLw len=0 
' 0018     22 LABEL : Cell Value, String Constant - UfcWmfp len=0 
' 0018     23 LABEL : Cell Value, String Constant - uRdlrfFC len=0 
' 0018     24 LABEL : Cell Value, String Constant - XfxcqBrve len=0 
' 0018     20 LABEL : Cell Value, String Constant - YzAQW 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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