Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 044b34af397455c2…

MALICIOUS

Office (OLE)

175.0 KB Created: 2020-07-16 03:34:56 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 5818f0390747b113b0ffe79be5b6b7d1 SHA-1: e4e6a950eb3764fc0f28a489e4c4a17869fe56df SHA-256: 044b34af397455c2908d3f6f80eeead907af25f286506380fb9bd477b0eeed29
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function, which is a critical finding. The macros are designed to execute dangerous functions, including a RUN command, and the document body contains a URL that is likely used to download a second-stage payload. The presence of the Auto_Open macro and the embedded URL strongly suggests a downloader attack pattern.

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-8895281-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8895281-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

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) 65212 bytes
SHA-256: f0d10f662a40c95b340a5dc94b242db8a8aef2fc83d04a513f0d0176f9d330c6
Preview script
First 1,000 lines of the extracted script
' 0085     11 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vr
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  XmqtlKn
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     23 LABEL : Cell Value, String Constant - acJdiqgM len=0 
' 0018     18 LABEL : Cell Value, String Constant - aEG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  vr!R44822 
' 0018     16 LABEL : Cell Value, String Constant - b len=0 
' 0018     23 LABEL : Cell Value, String Constant - bCLXzTyW len=0 
' 0018     34 LABEL : Cell Value, String Constant - bpxyIgbEGmsMUKpkljo len=0 
' 0018     25 LABEL : Cell Value, String Constant - bpzUhVIiFE len=0 
' 0018     29 LABEL : Cell Value, String Constant - BqhvGoobOpLYmU len=0 
' 0018     52 LABEL : Cell Value, String Constant - BwIMavxHRLoFXrLFuajjimYRYDPPeildCRKtb len=0 
' 0018     47 LABEL : Cell Value, String Constant - bzSrSdXpYvfpvrEUjqsCZUxzgmGODiee len=0 
' 0018     56 LABEL : Cell Value, String Constant - cjOoaptwoNqVFBpKzqFPxxkXyUhvdugkKyvpIFcxW len=0 
' 0018     45 LABEL : Cell Value, String Constant - ckxZtYwOaPMGYVscmsozRSnpyWDgwd len=0 
' 0018     48 LABEL : Cell Value, String Constant - CPZuIvhJfdGnFquVuGzSPmIgZVgxMhVfD len=0 
' 0018     22 LABEL : Cell Value, String Constant - cWolIeD len=0 
' 0018     23 LABEL : Cell Value, String Constant - Ddmybuax len=0 
' 0018     18 LABEL : Cell Value, String Constant - dFE len=0 
' 0018     29 LABEL : Cell Value, String Constant - DgLJqfzqhuFonb len=0 
' 0018     27 LABEL : Cell Value, String Constant - diTZhxYXndgY len=0 
' 0018     35 LABEL : Cell Value, String Constant - DKoBBQUXOnDvfNQkNRfb len=0 
' 0018     51 LABEL : Cell Value, String Constant - eFbnCjBnrRFDwPMiFdjfqtJefpytXmGasncI len=0 
' 0018     27 LABEL : Cell Value, String Constant - eKhzMzxrKHdN len=0 
' 0018     62 LABEL : Cell Value, String Constant - eQUuUfZroMhGyuGXlHuFcXBCiDIQGluutyVcjObaqtwoNcV len=0 
' 0018     51 LABEL : Cell Value, String Constant - fbQkaRfpYYLxYuIWEVHLkZWQifCYwDyKOcxz len=0 
' 0018     51 LABEL : Cell Value, String Constant - fNeRVuVgaspMiHyuHXmIvFcXBDjEJRGluvty len=0 
' 0018     30 LABEL : Cell Value, String Constant - FnpKmrFCkxXXyHU len=0 
' 0018     58 LABEL : Cell Value, String Constant - GLZVESqrSbnQjOmFeFQKcLiScieqHWdfoMHkmTZsBpW len=0 
' 0018     35 LABEL : Cell Value, String Constant - hhJRdGZFduHusmFCYITY len=0 
' 0018     27 LABEL : Cell Value, String Constant - hIitnGDZuTMI len=0 
' 0018     63 LABEL : Cell Value, String Constant - hTXxlicusPkJPLXaoKMVfaETlGZTJoxywCmfmRedtwzrQfYJ len=0 
' 0018     45 LABEL : Cell Value, String Constant - HYKOnOZTliFbzrnzRfBoxVQtvcwCKz len=0 
' 0018     23 LABEL : Cell Value, String Constant - IaKgQbhd len=0 
' 0018     42 LABEL : Cell Value, String Constant - iIWPzhjEglyverRRsBOpKoNeFfq len=0 
' 0018     43 LABEL : Cell Value, String Constant - ImNyOSVMlOtdZOiYPdnWWJvWsGUC len=0 
' 0018     50 LABEL : Cell Value, String Constant - iPXYWbMGNqEDTXaRqGyiQSnQUisNbOBbxwZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - irPwa len=0 
' 0018     54 LABEL : Cell Value, String Constant - IsacxaesoXlLLluHjDiGYxYjdveClvCxKapwyIf len=0 
' 0018     32 LABEL : Cell Value, String Constant - ItKNQIgKoYUJdUKYi len=0 
' 0018     26 LABEL : Cell Value, String Constant - IUllIJSpXBQ len=0 
' 0018     47 LABEL : Cell Value, String Constant - IWefoMHkmTZsBqWRSQVGNUkLLaQTLkNr len=0 
' 0018     43 LABEL : Cell Value, String Constant - jDLzfbbaeQJQuVHWadVtXClhWqgX len=0 
' 0018     63 LABEL : Cell Value, String Constant - JfCaSOaqGbPYvqUWDXckaGOPNSpwEhutKORIhwpZHKeHLZVE len=0 
' 0018     49 LABEL : Cell Value, String Constant - JFQUiEGPZTwNfzTNDirrqugZgLXXmqtlKZ len=0 
' 0018     61 LABEL : Cell Value, String Constant - JjuoHqNwHNJVmBJKTqlPRxEXfVBvwuzkryPppFuxpPrWUC len=0 
' 0018     64 LABEL : Cell Valu
... (truncated)

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