Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 17091f29bed9e1f7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:42 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 8e6aa959624a1554525bc8d40f901979 SHA-1: 5bdc1186349a150d4139db46dc978d50955295a6 SHA-256: 17091f29bed9e1f7a528b8a2ea365b8b4e19e56db1620cd3f4c37caba5411bf6
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download payloads. Without further script content, the exact payload and execution chain remain unknown.

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) 6605 bytes
SHA-256: 4a4333e14333c6a3b26cec585f6d4cbd249e505b918fab628ece9c9c2e50bfda
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kqiibtrjfvH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I191 
' 0018     26 LABEL : Cell Value, String Constant - BNaWVuChLDP len=0 
' 0018     21 LABEL : Cell Value, String Constant - bOoIYn len=0 
' 0018     22 LABEL : Cell Value, String Constant - bSelrZY len=0 
' 0018     20 LABEL : Cell Value, String Constant - BvuTO len=0 
' 0018     20 LABEL : Cell Value, String Constant - dsUcd len=0 
' 0018     21 LABEL : Cell Value, String Constant - HGnuoM len=0 
' 0018     25 LABEL : Cell Value, String Constant - kDTueeJXAj len=0 
' 0018     25 LABEL : Cell Value, String Constant - mscAtRxcwP len=0 
' 0018     21 LABEL : Cell Value, String Constant - nvzYak len=0 
' 0018     25 LABEL : Cell Value, String Constant - NYoSYBrVaE len=0 
' 0018     21 LABEL : Cell Value, String Constant - qclGIb len=0 
' 0018     24 LABEL : Cell Value, String Constant - QxOlFjPgE len=0 
' 0018     25 LABEL : Cell Value, String Constant - SpGzYHjhbH len=0 
' 0018     25 LABEL : Cell Value, String Constant - TfWfxFdFYr len=0 
' 0018     21 LABEL : Cell Value, String Constant - VWrGWF len=0 
' 0018     22 LABEL : Cell Value, String Constant - xArAHZN len=0 
' 0018     23 LABEL : Cell Value, String Constant - xjGYTQvW len=0 
' 0018     27 LABEL : Cell Value, String Constant - XzWjdCdXpyGC len=0 
' 0018     20 LABEL : Cell Value, String Constant - YKvJs len=0 
' 0018     25 LABEL : Cell Value, String Constant - YUXMZHiSdb 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 LA
... (truncated)

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