Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b683d301e106982a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:49 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: fb0b25b5ab67caeef8b7dc2cb06683b8 SHA-1: 6f2bbbaf5287ebe74fdf82fbf6cf8266278b2b49 SHA-256: b683d301e106982a31c446619078297f28da5964574c70da04b70b5092099b2c
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 automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. The macro sheet likely serves as a loader for a secondary payload, although the specific commands or URLs are not directly visible in the provided evidence.

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) 6879 bytes
SHA-256: 26f805b99082c40a32c0a6f5215469eb713fcf5032b7d81919e2f325d2d58eda
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TdkEZbRiMB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D133 
' 0018     27 LABEL : Cell Value, String Constant - aWFXMuhyjYDq len=0 
' 0018     26 LABEL : Cell Value, String Constant - BnbuMAnfZks len=0 
' 0018     23 LABEL : Cell Value, String Constant - BsGudEnO len=0 
' 0018     25 LABEL : Cell Value, String Constant - bujCwQJCta len=0 
' 0018     25 LABEL : Cell Value, String Constant - CPAKTWNpWo len=0 
' 0018     22 LABEL : Cell Value, String Constant - EPYqoPU len=0 
' 0018     20 LABEL : Cell Value, String Constant - gOjyd len=0 
' 0018     21 LABEL : Cell Value, String Constant - jdGuFC len=0 
' 0018     27 LABEL : Cell Value, String Constant - jfumYONnKhJJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - JklNSW len=0 
' 0018     20 LABEL : Cell Value, String Constant - JOYon len=0 
' 0018     21 LABEL : Cell Value, String Constant - kMFAcy len=0 
' 0018     20 LABEL : Cell Value, String Constant - KRIBS len=0 
' 0018     24 LABEL : Cell Value, String Constant - OmsRLSjcU len=0 
' 0018     20 LABEL : Cell Value, String Constant - PDCRv len=0 
' 0018     23 LABEL : Cell Value, String Constant - PMUNQGnD len=0 
' 0018     26 LABEL : Cell Value, String Constant - tWvackHnReh len=0 
' 0018     25 LABEL : Cell Value, String Constant - UTCAtNXDMB len=0 
' 0018     26 LABEL : Cell Value, String Constant - YQlyfKMMxHQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZBoaGGyH 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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