Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d6f5ba9d954c251…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:56 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 9730e3a8ac4d71ffa4e1d091513f6ccd SHA-1: 1a77fb1022987eb5766f2c3a37995e8515d10d86 SHA-256: 1d6f5ba9d954c251b2b9d7b432cbdf6cde9ccd3e6ee5c9935092ef2fb109b4b3
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. Without further script content or network indicators, the exact payload and family 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) 6589 bytes
SHA-256: 65b09867a81e8e12824e14a7e9b50d954c29e1c675f48b10bce853547635eb06
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 -  nFrC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D144 
' 0018     23 LABEL : Cell Value, String Constant - BjyeaMsP len=0 
' 0018     20 LABEL : Cell Value, String Constant - bZbwj len=0 
' 0018     23 LABEL : Cell Value, String Constant - CnXpKuem len=0 
' 0018     27 LABEL : Cell Value, String Constant - EghaeeapKQUo len=0 
' 0018     21 LABEL : Cell Value, String Constant - FsbxWW len=0 
' 0018     22 LABEL : Cell Value, String Constant - FTfOUUO len=0 
' 0018     25 LABEL : Cell Value, String Constant - fVLSElNMcC len=0 
' 0018     23 LABEL : Cell Value, String Constant - HReoycAL len=0 
' 0018     20 LABEL : Cell Value, String Constant - iAGTl len=0 
' 0018     21 LABEL : Cell Value, String Constant - iTjpaq len=0 
' 0018     25 LABEL : Cell Value, String Constant - ItyzSNAVkI len=0 
' 0018     26 LABEL : Cell Value, String Constant - jEiPTYdDjAv len=0 
' 0018     20 LABEL : Cell Value, String Constant - jvucf len=0 
' 0018     22 LABEL : Cell Value, String Constant - SZgjJtx len=0 
' 0018     21 LABEL : Cell Value, String Constant - tRUawr len=0 
' 0018     21 LABEL : Cell Value, String Constant - tvlvFi len=0 
' 0018     21 LABEL : Cell Value, String Constant - vzArpA len=0 
' 0018     22 LABEL : Cell Value, String Constant - YPhEjJF len=0 
' 0018     22 LABEL : Cell Value, String Constant - YTQqdxv len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZozESdDpVSNE 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 LABELSST : Cell 
... (truncated)

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