Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a1ebc01957a4cf4…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:42:50 Authoring application: Microsoft Excel First seen: 2021-10-02
MD5: 9699c1f1b8fe1685869000640b3cae75 SHA-1: d9f7caab4c3eb1ae1b94de4d5e819a3ef3693eeb SHA-256: 6a1ebc01957a4cf4fb2030ce4d0c908aca4e9a1a4d352cb49d927d9abead900d
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open function, which is a critical finding indicating potential execution of malicious code. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute commands, likely for downloading and running a second-stage payload. No specific family could be identified.

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) 6485 bytes
SHA-256: 30d87d4be53d476c34dfba41a97e02c720f7193542de26834eff7548d1403a5f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eRxd
' 0018     27 LABEL : Cell Value, String Constant - aBvUzDTStrBh len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D163 
' 0018     27 LABEL : Cell Value, String Constant - bhOzmdtQeEsD len=0 
' 0018     24 LABEL : Cell Value, String Constant - byCIkVsOy len=0 
' 0018     25 LABEL : Cell Value, String Constant - bYXHDHlLQc len=0 
' 0018     25 LABEL : Cell Value, String Constant - cjdipKyest len=0 
' 0018     26 LABEL : Cell Value, String Constant - CVUcIYetMWB len=0 
' 0018     24 LABEL : Cell Value, String Constant - GpFKLvXoG len=0 
' 0018     23 LABEL : Cell Value, String Constant - jEAQutOn len=0 
' 0018     25 LABEL : Cell Value, String Constant - KhGueAeeGx len=0 
' 0018     22 LABEL : Cell Value, String Constant - Mjacjlx len=0 
' 0018     22 LABEL : Cell Value, String Constant - MwHkxEE len=0 
' 0018     21 LABEL : Cell Value, String Constant - nmVKNu len=0 
' 0018     20 LABEL : Cell Value, String Constant - NTypi len=0 
' 0018     24 LABEL : Cell Value, String Constant - obgEyCEBK len=0 
' 0018     25 LABEL : Cell Value, String Constant - ohqKQNzDYH len=0 
' 0018     21 LABEL : Cell Value, String Constant - QFtybt len=0 
' 0018     22 LABEL : Cell Value, String Constant - QmHZtLm len=0 
' 0018     23 LABEL : Cell Value, String Constant - rcwZrTrj len=0 
' 0018     26 LABEL : Cell Value, String Constant - reqCFpaTRfm len=0 
' 0018     27 LABEL : Cell Value, String Constant - TAloPCwxQJbQ 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
' 0
... (truncated)

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