Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 69d939345c032efe…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:22 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: b47156bfb8f50d238d1fb572ea85e645 SHA-1: 3048380b6dfa1c1658018d85361fce870384674a SHA-256: 69d939345c032efed0cfac590353384f74c8fc667b55edb2a164c581a7b6eb23
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 entry, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN further indicates an intent to execute arbitrary commands. While no specific URLs or hashes were extracted, the Auto_Open macro itself is a critical IOC pointing to a macro-based execution chain.

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) 6628 bytes
SHA-256: c21b191b3784bbe9c4cb2218d636e44e9376f64832e73cbd1e76ce2f951c731b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YgMmwOoGM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A161 
' 0018     20 LABEL : Cell Value, String Constant - CIFte len=0 
' 0018     25 LABEL : Cell Value, String Constant - FdPVirixyt len=0 
' 0018     22 LABEL : Cell Value, String Constant - FRtIYUM len=0 
' 0018     20 LABEL : Cell Value, String Constant - hCHTB len=0 
' 0018     27 LABEL : Cell Value, String Constant - mCGOlOGzobgU len=0 
' 0018     20 LABEL : Cell Value, String Constant - NebOq len=0 
' 0018     25 LABEL : Cell Value, String Constant - OcITWbPuxB len=0 
' 0018     25 LABEL : Cell Value, String Constant - PdYsVDYBcA len=0 
' 0018     20 LABEL : Cell Value, String Constant - QcoQi len=0 
' 0018     24 LABEL : Cell Value, String Constant - qnwZHYjHL len=0 
' 0018     26 LABEL : Cell Value, String Constant - RQkyJOHQsDH len=0 
' 0018     22 LABEL : Cell Value, String Constant - RyfpRde len=0 
' 0018     21 LABEL : Cell Value, String Constant - sAqvrC len=0 
' 0018     24 LABEL : Cell Value, String Constant - suMumNnKl len=0 
' 0018     26 LABEL : Cell Value, String Constant - TtsVzsYrbJb len=0 
' 0018     24 LABEL : Cell Value, String Constant - vkYZgjSVy len=0 
' 0018     27 LABEL : Cell Value, String Constant - WebgoXKrbQrl len=0 
' 0018     21 LABEL : Cell Value, String Constant - wrziFZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - XoZqqOjXnK len=0 
' 0018     23 LABEL : Cell Value, String Constant - zeegXORX 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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