Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d3891fd4d018559…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:14 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: b8bd6dd78e911192ca00efd003b7f8c7 SHA-1: 2e8a93582cd382126c3a54130ca6efe97e3e12ff SHA-256: 1d3891fd4d0185590bcc4860d28b5617b46b7e82d092eb5949333821fa83cfe8
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 defined name, which is a critical finding indicating potential automatic execution of malicious code upon opening. The presence of dangerous formula APIs like RUN further increases the risk. The macro sheet itself contains obfuscated data, suggesting an attempt to hide its true functionality.

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) 6673 bytes
SHA-256: b7086285a47e375e795779956517c859a0baf688ca78bf2945d7a013c6e17914
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tZGZMO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I184 
' 0018     21 LABEL : Cell Value, String Constant - cnwBOn len=0 
' 0018     25 LABEL : Cell Value, String Constant - CWHAclJqdY len=0 
' 0018     23 LABEL : Cell Value, String Constant - dbbqiSZs len=0 
' 0018     25 LABEL : Cell Value, String Constant - DnjFsxhNjm len=0 
' 0018     24 LABEL : Cell Value, String Constant - ekXnEkNKz len=0 
' 0018     26 LABEL : Cell Value, String Constant - fYBqRAEuTZY len=0 
' 0018     23 LABEL : Cell Value, String Constant - GLLqmjsd len=0 
' 0018     24 LABEL : Cell Value, String Constant - GPdHymIJq len=0 
' 0018     25 LABEL : Cell Value, String Constant - HnBzPhxNwQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - IzUpIsa len=0 
' 0018     27 LABEL : Cell Value, String Constant - jshOZxUsIWwx len=0 
' 0018     27 LABEL : Cell Value, String Constant - kSuDalsRtCVV len=0 
' 0018     22 LABEL : Cell Value, String Constant - lVapnlS len=0 
' 0018     23 LABEL : Cell Value, String Constant - MClbqEoz len=0 
' 0018     21 LABEL : Cell Value, String Constant - MjWiBG len=0 
' 0018     21 LABEL : Cell Value, String Constant - OshoGF len=0 
' 0018     27 LABEL : Cell Value, String Constant - SKKsWTUYJMzi len=0 
' 0018     23 LABEL : Cell Value, String Constant - SqUVFgAs len=0 
' 0018     21 LABEL : Cell Value, String Constant - sRFMLS len=0 
' 0018     21 LABEL : Cell Value, String Constant - TqzkbI 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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