Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e676d785465c74c1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:15 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 8ff44f39ee5b3cd5021d09b599407526 SHA-1: dea656b94afbfa066695a871e195c77c1ea49749 SHA-256: e676d785465c74c1463964ffdeb1112564e32b95261749327f8ecfa325dc6e6e
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 defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs, specifically the RUN function, strongly suggests the macro is designed to execute arbitrary commands. This is a common technique for downloading and executing further malicious content.

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) 6394 bytes
SHA-256: 25a5cd27b5c48de19ecec279cb8f0e887b1f25f7f9c310c421eb6e9ccffa57c3
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VDt
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C152 
' 0018     26 LABEL : Cell Value, String Constant - bxuboaqXECP len=0 
' 0018     21 LABEL : Cell Value, String Constant - EfJcEl len=0 
' 0018     25 LABEL : Cell Value, String Constant - egeJmQtdWs len=0 
' 0018     27 LABEL : Cell Value, String Constant - gjqzWMitqnQS len=0 
' 0018     22 LABEL : Cell Value, String Constant - HpAxJVJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - JoPBT len=0 
' 0018     22 LABEL : Cell Value, String Constant - jwaDDvr len=0 
' 0018     21 LABEL : Cell Value, String Constant - kwreLO len=0 
' 0018     24 LABEL : Cell Value, String Constant - lbNeeABDj len=0 
' 0018     21 LABEL : Cell Value, String Constant - NzVggt len=0 
' 0018     22 LABEL : Cell Value, String Constant - obBPQae len=0 
' 0018     24 LABEL : Cell Value, String Constant - PrZYDzgtc len=0 
' 0018     24 LABEL : Cell Value, String Constant - smPlPUoIv len=0 
' 0018     27 LABEL : Cell Value, String Constant - tgLKbngTAaEa len=0 
' 0018     21 LABEL : Cell Value, String Constant - VUIPcv len=0 
' 0018     21 LABEL : Cell Value, String Constant - WKTKUG len=0 
' 0018     22 LABEL : Cell Value, String Constant - wMPWYMr len=0 
' 0018     21 LABEL : Cell Value, String Constant - WQTSPX len=0 
' 0018     23 LABEL : Cell Value, String Constant - yEdSKEdA len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZDpEIaKGWQSz 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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