Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b2b75b868c500fbe…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:47 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 9cce3cbbc8703f3be4ce0d607162f590 SHA-1: 0ec695d625ad4254c37b0ad23f765700c80018c8 SHA-256: b2b75b868c500fbe6c160494ac53a22015abb26aec0b6a8465b24f6cbb28ca3b
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 indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism points to a downloader or initial execution stage.

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) 6568 bytes
SHA-256: cd3ef7ee0fcf983282d99fa540ac827941a3ea4af00000d3c186d2c06b0703c1
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 -  HFc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G134 
' 0018     25 LABEL : Cell Value, String Constant - AVVMYqzjMT len=0 
' 0018     21 LABEL : Cell Value, String Constant - DHmRFv len=0 
' 0018     25 LABEL : Cell Value, String Constant - GyuMjlIzNC len=0 
' 0018     27 LABEL : Cell Value, String Constant - jFCWXUwnZuAS len=0 
' 0018     27 LABEL : Cell Value, String Constant - kmCRmMLILQmJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - KOaFrcRQmSiq len=0 
' 0018     27 LABEL : Cell Value, String Constant - lDQvfJhMShEZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - ndHvYkluyw len=0 
' 0018     20 LABEL : Cell Value, String Constant - pSZWK len=0 
' 0018     27 LABEL : Cell Value, String Constant - QjZPQxisEisp len=0 
' 0018     20 LABEL : Cell Value, String Constant - qlUXC len=0 
' 0018     21 LABEL : Cell Value, String Constant - qNsfln len=0 
' 0018     21 LABEL : Cell Value, String Constant - UkEYNV len=0 
' 0018     22 LABEL : Cell Value, String Constant - vesVHhQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - VpKJVUKXbUj len=0 
' 0018     22 LABEL : Cell Value, String Constant - wKsRWZf len=0 
' 0018     23 LABEL : Cell Value, String Constant - xFKLVUVX len=0 
' 0018     27 LABEL : Cell Value, String Constant - YauRLGpuzOun len=0 
' 0018     24 LABEL : Cell Value, String Constant - zheDRCVuT len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZndlPNDUwaX 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

... (truncated)

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