Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea1a07b04abbd2b5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:03 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: b98828e9e28f256c4e86bc2520cb86c8 SHA-1: eaf370daf02f6206011b3c127b0b3eff20844696 SHA-256: ea1a07b04abbd2b5a1e59d0d979a62b6933a266c32698da9890aa00d3793101f
140 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open defined name and dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code upon opening the document. The presence of obfuscated data in the document body further supports the malicious intent, likely to download and execute 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) 6457 bytes
SHA-256: 2077341ea883bc158835d6f5105c590fcf07365d8142f57824a546dbcb9ba95b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hRxOHj
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D148 
' 0018     27 LABEL : Cell Value, String Constant - bXoyqGnEwFzC len=0 
' 0018     26 LABEL : Cell Value, String Constant - CXxLcJDDLha len=0 
' 0018     27 LABEL : Cell Value, String Constant - FPzlUATiNrCz len=0 
' 0018     25 LABEL : Cell Value, String Constant - ghZYLYOPaz len=0 
' 0018     27 LABEL : Cell Value, String Constant - gPKUXnNfcaKz len=0 
' 0018     24 LABEL : Cell Value, String Constant - GqWxwHeFa len=0 
' 0018     20 LABEL : Cell Value, String Constant - HbWMO len=0 
' 0018     23 LABEL : Cell Value, String Constant - hdVSXebH len=0 
' 0018     24 LABEL : Cell Value, String Constant - izKxwgctM len=0 
' 0018     21 LABEL : Cell Value, String Constant - JuKKGO len=0 
' 0018     25 LABEL : Cell Value, String Constant - Jyimvmzgej len=0 
' 0018     24 LABEL : Cell Value, String Constant - KWuFKTHiq len=0 
' 0018     22 LABEL : Cell Value, String Constant - mkffPUD len=0 
' 0018     23 LABEL : Cell Value, String Constant - qVlhOJnz len=0 
' 0018     20 LABEL : Cell Value, String Constant - RkxWv len=0 
' 0018     20 LABEL : Cell Value, String Constant - RpbOH len=0 
' 0018     21 LABEL : Cell Value, String Constant - tUYIbb len=0 
' 0018     21 LABEL : Cell Value, String Constant - uGYjCn len=0 
' 0018     21 LABEL : Cell Value, String Constant - VlGgGE len=0 
' 0018     25 LABEL : Cell Value, String Constant - VmSzcVbLSX 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 
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.