Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 335ade9fc7fc962c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:37 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: d4c7e0f06a9b75f6e35287f34b914a58 SHA-1: e079ad6634ea9787698bbdf8c14257c87f9edc69 SHA-256: 335ade9fc7fc962cd026795de6dcfba8defbbcb198db954dc1aeb8051bca8d6f
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open function. This function is designed to execute automatically when the workbook is opened, indicating an attempt to run arbitrary code. The presence of dangerous formula APIs in the Auto_Open macro suggests the execution of malicious commands.

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) 6843 bytes
SHA-256: af2f3ce8f9dc4bbad26952ec3da8773da77469b77e0d645ee6a15155ec316020
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WOseJhIwcH
' 0018     21 LABEL : Cell Value, String Constant - adKXwM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F155 
' 0018     26 LABEL : Cell Value, String Constant - FgWAdcxyPwb len=0 
' 0018     21 LABEL : Cell Value, String Constant - gzSbWs len=0 
' 0018     21 LABEL : Cell Value, String Constant - IjQFsL len=0 
' 0018     27 LABEL : Cell Value, String Constant - imvilBzMWMLx len=0 
' 0018     27 LABEL : Cell Value, String Constant - JflIAwIYsPXV len=0 
' 0018     23 LABEL : Cell Value, String Constant - jxsLouND len=0 
' 0018     20 LABEL : Cell Value, String Constant - Lxwqq len=0 
' 0018     21 LABEL : Cell Value, String Constant - MEkmTa len=0 
' 0018     23 LABEL : Cell Value, String Constant - ObwUKVRD len=0 
' 0018     22 LABEL : Cell Value, String Constant - OMlSGoD len=0 
' 0018     21 LABEL : Cell Value, String Constant - OonLJt len=0 
' 0018     22 LABEL : Cell Value, String Constant - ozsonSB len=0 
' 0018     25 LABEL : Cell Value, String Constant - PvCexpPFPF len=0 
' 0018     21 LABEL : Cell Value, String Constant - rcIagi len=0 
' 0018     22 LABEL : Cell Value, String Constant - sCxhkhC len=0 
' 0018     21 LABEL : Cell Value, String Constant - sFgQRj len=0 
' 0018     27 LABEL : Cell Value, String Constant - xDzeTqsJsFmd len=0 
' 0018     21 LABEL : Cell Value, String Constant - XpNJyi len=0 
' 0018     23 LABEL : Cell Value, String Constant - XWMdZSsu 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 LABELSS
... (truncated)

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