Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d9919f97e9f86f97…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:54 Authoring application: Microsoft Excel First seen: 2021-10-16
MD5: 894fe156e2a2f01a47a000aab597008c SHA-1: 860732d0b299a16b56b44f9e1cdb74f53719e4d7 SHA-256: d9919f97e9f86f9791f37aae8a04267d0298c0fe66b69f59d07834b033a59753
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-enabled workbook containing an Auto_Open function, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. No specific URLs or hashes were extracted, but the Auto_Open macro itself is the primary IOC for this type of attack.

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) 6654 bytes
SHA-256: 6ef3f741a9d7fc67754866235e4426c32417d34b6d5a4496fa9b513c7b0b20ab
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 -  Kxtdl
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I191 
' 0018     26 LABEL : Cell Value, String Constant - cAswajHYNMK len=0 
' 0018     22 LABEL : Cell Value, String Constant - cWTufPe len=0 
' 0018     22 LABEL : Cell Value, String Constant - EjwdYwo len=0 
' 0018     27 LABEL : Cell Value, String Constant - EPBENlSIrKOG len=0 
' 0018     25 LABEL : Cell Value, String Constant - HglkslqOyJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - HzOKfrgtODbp len=0 
' 0018     24 LABEL : Cell Value, String Constant - jiGvLGOUp len=0 
' 0018     21 LABEL : Cell Value, String Constant - KmAaoq len=0 
' 0018     27 LABEL : Cell Value, String Constant - lnyBlMbLRsiu len=0 
' 0018     25 LABEL : Cell Value, String Constant - mfkmKaTdZG len=0 
' 0018     25 LABEL : Cell Value, String Constant - MgOtDOzWWu len=0 
' 0018     20 LABEL : Cell Value, String Constant - Nacep len=0 
' 0018     22 LABEL : Cell Value, String Constant - NXwXlQW len=0 
' 0018     20 LABEL : Cell Value, String Constant - PxYvj len=0 
' 0018     22 LABEL : Cell Value, String Constant - qwxyuik len=0 
' 0018     20 LABEL : Cell Value, String Constant - RIhAS len=0 
' 0018     24 LABEL : Cell Value, String Constant - TmQMAVGuA len=0 
' 0018     22 LABEL : Cell Value, String Constant - UaVodrI len=0 
' 0018     27 LABEL : Cell Value, String Constant - WdTJFSMIpCqR len=0 
' 0018     26 LABEL : Cell Value, String Constant - WRCVDwnmatn 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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