Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5daedf0a569d93e7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:26 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: f92538cbc7b8d54f441037229d85cb38 SHA-1: d171565472b3e19ac01392669353c280d5fc82fa SHA-256: 5daedf0a569d93e72ec07b0914c7de3d311028913b1c436954cddca14f725722
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 critical finding. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs further suggests 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) 6606 bytes
SHA-256: e1898389fabab960c4fa5db12083c5880a834c488aba9de7aeff6ce5d771c8b3
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 -  SWr
' 0018     21 LABEL : Cell Value, String Constant - adMAYj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A161 
' 0018     24 LABEL : Cell Value, String Constant - CgQXVRHwM len=0 
' 0018     24 LABEL : Cell Value, String Constant - DSkalSghf len=0 
' 0018     20 LABEL : Cell Value, String Constant - ENXVB len=0 
' 0018     24 LABEL : Cell Value, String Constant - FDYtYoLQk len=0 
' 0018     22 LABEL : Cell Value, String Constant - FJdzHIP len=0 
' 0018     27 LABEL : Cell Value, String Constant - IlQmlyIAMsEj len=0 
' 0018     23 LABEL : Cell Value, String Constant - jAXVWsgR len=0 
' 0018     22 LABEL : Cell Value, String Constant - JGeSfJS len=0 
' 0018     22 LABEL : Cell Value, String Constant - JjubpIz len=0 
' 0018     25 LABEL : Cell Value, String Constant - JlXxXNNVJH len=0 
' 0018     25 LABEL : Cell Value, String Constant - lQJKABKRzZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - lviFCVmb len=0 
' 0018     21 LABEL : Cell Value, String Constant - McpUck len=0 
' 0018     27 LABEL : Cell Value, String Constant - oPCafxXLVGqu len=0 
' 0018     24 LABEL : Cell Value, String Constant - qHDfdbTvq len=0 
' 0018     21 LABEL : Cell Value, String Constant - rQzJfw len=0 
' 0018     24 LABEL : Cell Value, String Constant - SwdcvVpPP len=0 
' 0018     23 LABEL : Cell Value, String Constant - ukPAgccb len=0 
' 0018     26 LABEL : Cell Value, String Constant - WBatsCrjOBU 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 L
... (truncated)

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