Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5446a6b91d745abe…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:16 Authoring application: Microsoft Excel First seen: 2021-10-04
MD5: c03deb80c69d635bbd86d86f1c414321 SHA-1: acf9308b12b0d5f755b84e8ff27004bb57ccf708 SHA-256: 5446a6b91d745abe2d77f68ac0fb7cd71cf6df9456666c029c0798ced98dd01d
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The presence of an Auto_Open defined name suggests that the macro will execute automatically upon opening the workbook. The dangerous formula APIs used, specifically 'RUN', strongly indicate that the macro is intended to execute an external program or download a payload. No specific URLs or hashes were extracted, limiting further analysis of the 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) 6719 bytes
SHA-256: 96018e58f3bc89f0e6bea67af09bfac855729244b46ba91680ec4e6942c0b2da
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 -  eTPFK
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B151 
' 0018     24 LABEL : Cell Value, String Constant - aXNWBnUVz len=0 
' 0018     24 LABEL : Cell Value, String Constant - DIVehyDzN len=0 
' 0018     24 LABEL : Cell Value, String Constant - FNcjKxCcK len=0 
' 0018     25 LABEL : Cell Value, String Constant - iVrQOUNfpO len=0 
' 0018     25 LABEL : Cell Value, String Constant - kJtdxCLJTa len=0 
' 0018     23 LABEL : Cell Value, String Constant - KodoMrYN len=0 
' 0018     23 LABEL : Cell Value, String Constant - lXyXKiyy len=0 
' 0018     26 LABEL : Cell Value, String Constant - MHiQhjvDbEy len=0 
' 0018     23 LABEL : Cell Value, String Constant - NwMUiDvz len=0 
' 0018     26 LABEL : Cell Value, String Constant - qWARCDBfgMf len=0 
' 0018     23 LABEL : Cell Value, String Constant - rthSszZZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - RZIrqbvqbCGA len=0 
' 0018     26 LABEL : Cell Value, String Constant - sKGfrOWEZSI len=0 
' 0018     22 LABEL : Cell Value, String Constant - UCYUZHo len=0 
' 0018     27 LABEL : Cell Value, String Constant - VOkTrkUZuRyq len=0 
' 0018     22 LABEL : Cell Value, String Constant - VRvqVaQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - WqlhkgciJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - XrGfnGktRBob len=0 
' 0018     24 LABEL : Cell Value, String Constant - YFUWohYyR len=0 
' 0018     22 LABEL : Cell Value, String Constant - zeyZIuQ 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
... (truncated)

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