Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b1498bef08e7831a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:22 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: fe4051f524df7284a777406964edeaec SHA-1: 77f577a770028faeb58475d7a9593d53494f3fda SHA-256: b1498bef08e7831a59424925df26436a238bb11f1e8ed006cc1ae7ad9b8dd102
140 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open defined name and dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute code upon opening the document. While no specific URLs or hashes were extracted, the presence of these dangerous functions strongly implies a malicious intent to download and execute a second-stage payload.

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) 6732 bytes
SHA-256: c63957a5536dad700a2df103dd899c737d6c678ba77246f43450277518a4e735
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 -  hTlovx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B169 
' 0018     26 LABEL : Cell Value, String Constant - aXWmNrlGNPc len=0 
' 0018     26 LABEL : Cell Value, String Constant - cueapUkgzge len=0 
' 0018     24 LABEL : Cell Value, String Constant - dIOWhzgCj len=0 
' 0018     20 LABEL : Cell Value, String Constant - dndnZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - eOfDujqwDbD len=0 
' 0018     21 LABEL : Cell Value, String Constant - fHkMre len=0 
' 0018     25 LABEL : Cell Value, String Constant - jqXSMBiLXx len=0 
' 0018     23 LABEL : Cell Value, String Constant - KuQvhfOk len=0 
' 0018     27 LABEL : Cell Value, String Constant - lcegMotuhRnk len=0 
' 0018     24 LABEL : Cell Value, String Constant - LokkYMsFJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - nqxldqTcfMqY len=0 
' 0018     24 LABEL : Cell Value, String Constant - pcFRPbKfI len=0 
' 0018     20 LABEL : Cell Value, String Constant - PVeZm len=0 
' 0018     22 LABEL : Cell Value, String Constant - QCQdleu len=0 
' 0018     27 LABEL : Cell Value, String Constant - qRAudfrmSPqo len=0 
' 0018     26 LABEL : Cell Value, String Constant - uEmttUowGzw len=0 
' 0018     22 LABEL : Cell Value, String Constant - xzSYVGj len=0 
' 0018     27 LABEL : Cell Value, String Constant - yLswvDazegnX len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZpAFGZJBlLFx len=0 
' 0018     21 LABEL : Cell Value, String Constant - zpXJmC 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/
... (truncated)

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