Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5c689ec795c7a184…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:04 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: fc5df5f8cefd26cf60a21e7d65a4388e SHA-1: 81802a40c78e85c6e2bcf3a19ed28b1ba7eb3420 SHA-256: 5c689ec795c7a184f1a8be2146d6af667936b8352ebedc90e4116efbcc93fd19
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The macros are designed to run automatically when the workbook is opened, and the presence of dangerous formula APIs suggests the intent is to execute arbitrary code. This is commonly used to download and execute further malicious payloads.

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) 6946 bytes
SHA-256: 838eb9574be3d78c43540024365115237db93ae8ee96a71777ccf420435b1582
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ONeUUOZWqru
' 0018     21 LABEL : Cell Value, String Constant - ATudpo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E186 
' 0018     21 LABEL : Cell Value, String Constant - BcGiPq len=0 
' 0018     20 LABEL : Cell Value, String Constant - BGTok len=0 
' 0018     20 LABEL : Cell Value, String Constant - biLEz len=0 
' 0018     23 LABEL : Cell Value, String Constant - bIZIpWuy len=0 
' 0018     22 LABEL : Cell Value, String Constant - Dgyxpgv len=0 
' 0018     25 LABEL : Cell Value, String Constant - IUlxXlzYyU len=0 
' 0018     26 LABEL : Cell Value, String Constant - KNlcRiHtuDW len=0 
' 0018     24 LABEL : Cell Value, String Constant - LLmcledah len=0 
' 0018     25 LABEL : Cell Value, String Constant - oSdUJaNsCa len=0 
' 0018     22 LABEL : Cell Value, String Constant - pEpTUMn len=0 
' 0018     23 LABEL : Cell Value, String Constant - PHyhnwkc len=0 
' 0018     25 LABEL : Cell Value, String Constant - QNerzXFDTR len=0 
' 0018     27 LABEL : Cell Value, String Constant - qvaYnBbikbyd len=0 
' 0018     21 LABEL : Cell Value, String Constant - TbhmZt len=0 
' 0018     20 LABEL : Cell Value, String Constant - UFiJC len=0 
' 0018     23 LABEL : Cell Value, String Constant - YGYJNGah len=0 
' 0018     22 LABEL : Cell Value, String Constant - YmlfauK len=0 
' 0018     20 LABEL : Cell Value, String Constant - zXgAS len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZYhoZmD 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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