Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6039bf49ff76c3e6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:07 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 938e0c86e6133066d2146496a2705ffd SHA-1: afcbcfe753f149389f633ff7cba71c6372ea66c1 SHA-256: 6039bf49ff76c3e6d031d84c8d4c95f38e1995d000af5d761dd5e09fe894daf5
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known method for executing malicious code upon opening the document. The `RUN=0` value associated with the dangerous formula API suggests the macro is designed to execute commands or download additional payloads. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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) 6640 bytes
SHA-256: 53096d59307aaca0bfb5f106b6ac780465bd5b102d27b43d7532167993382aef
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EvdkY
' 0018     20 LABEL : Cell Value, String Constant - AfRob len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B156 
' 0018     23 LABEL : Cell Value, String Constant - baejvFBx len=0 
' 0018     27 LABEL : Cell Value, String Constant - dCEyYpJjaAWI len=0 
' 0018     23 LABEL : Cell Value, String Constant - frlqWJOW len=0 
' 0018     26 LABEL : Cell Value, String Constant - JwfSYzAsHoS len=0 
' 0018     23 LABEL : Cell Value, String Constant - LRBNMaBi len=0 
' 0018     24 LABEL : Cell Value, String Constant - PrjdXexSN len=0 
' 0018     21 LABEL : Cell Value, String Constant - pwGzTN len=0 
' 0018     21 LABEL : Cell Value, String Constant - qgrRFQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - SbbtrqVnDt len=0 
' 0018     26 LABEL : Cell Value, String Constant - SUcZHnjpawV len=0 
' 0018     24 LABEL : Cell Value, String Constant - swkIlWMIY len=0 
' 0018     26 LABEL : Cell Value, String Constant - tqCpyIiUAPa len=0 
' 0018     22 LABEL : Cell Value, String Constant - TRxeeFM len=0 
' 0018     20 LABEL : Cell Value, String Constant - wSNYf len=0 
' 0018     26 LABEL : Cell Value, String Constant - xdUDqpbFYrM len=0 
' 0018     23 LABEL : Cell Value, String Constant - yJWWrkwp len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZhBvKD len=0 
' 0018     27 LABEL : Cell Value, String Constant - zKCnfLjyxbll len=0 
' 0018     25 LABEL : Cell Value, String Constant - zuADKcxWZf 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  
... (truncated)

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