Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5599067b00624ac6…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:25 Authoring application: Microsoft Excel First seen: 2021-09-15
MD5: 17ab38dadddb9680a36d95b816c72310 SHA-1: f4deac334e68cecc88f5a3b85e657f554dff9cd4 SHA-256: 5599067b00624ac6b8d621f2f8be8a9ecaca1d0897cd1f27ab8706c92ea0a976
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating that it will execute code automatically when opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands or download further payloads. The document body contains obfuscated text, likely intended to evade detection or mislead analysis.

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) 6683 bytes
SHA-256: 2c0237eb8a0fb0bd50f9022f27cbacc00cc046efdd4619184d4f11404a3afb1f
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 -  uLbrSP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B154 
' 0018     26 LABEL : Cell Value, String Constant - EUIcvJmburq len=0 
' 0018     25 LABEL : Cell Value, String Constant - fOcqRGbguA len=0 
' 0018     20 LABEL : Cell Value, String Constant - gqIWV len=0 
' 0018     23 LABEL : Cell Value, String Constant - GXcrqmaZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HmTNQN len=0 
' 0018     26 LABEL : Cell Value, String Constant - HSbXKwcwKEe len=0 
' 0018     20 LABEL : Cell Value, String Constant - HWSyg len=0 
' 0018     21 LABEL : Cell Value, String Constant - ICPxZc len=0 
' 0018     26 LABEL : Cell Value, String Constant - JFcXDtzFUgH len=0 
' 0018     24 LABEL : Cell Value, String Constant - kZEyFhYhI len=0 
' 0018     24 LABEL : Cell Value, String Constant - olEKDryqw len=0 
' 0018     23 LABEL : Cell Value, String Constant - QIMUQRZm len=0 
' 0018     20 LABEL : Cell Value, String Constant - qkQlV len=0 
' 0018     21 LABEL : Cell Value, String Constant - SILiXG len=0 
' 0018     22 LABEL : Cell Value, String Constant - UuIMidx len=0 
' 0018     24 LABEL : Cell Value, String Constant - vvopAMXBs len=0 
' 0018     25 LABEL : Cell Value, String Constant - wZokYNNNiJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - XGtZvr len=0 
' 0018     25 LABEL : Cell Value, String Constant - XmoRptMbAr len=0 
' 0018     20 LABEL : Cell Value, String Constant - zRhTS 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 
... (truncated)

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