Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cda0a147d0b4eb56…

MALICIOUS

Office (OLE)

397.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: bb5589a563d4312264e40a2902c2dd0a SHA-1: e99d79119cafa37d2273b66442b73ca8cd2387ff SHA-256: cda0a147d0b4eb5681493a36ba6d58b62f630f9e5053040cef9f0c5e46a05e38
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function that utilizes dangerous formula APIs like RUN. This indicates an attempt to execute arbitrary code, likely to download and run a second-stage payload from the obfuscated URL found in the document body. The obfuscated URL is reconstructed as "http://aqTGAfMUlsziC\cxKZdgwmeVLONDonFJSEu rvyIBQb PjWH".

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) 115014 bytes
SHA-256: 5d7544447f5410900ca4d2fd7e417c95c04fa0ba1d921638fb196e6463bd47de
Preview script
First 1,000 lines of the extracted script
' 0085     13 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Erro
' 0085     10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  r
' 0085     16 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  VeriSig
' 0018     40 LABEL : Cell Value, String Constant - aCXkygxjnNCysLIfBZfbnqFac len=0 
' 0018     20 LABEL : Cell Value, String Constant - aDHVf len=0 
' 0018     62 LABEL : Cell Value, String Constant - aEiSODXOFScLLykMiuJqItxYMKEWTpLjplxBQlmvGBetMgz len=0 
' 0018     38 LABEL : Cell Value, String Constant - aGBCzFpjqUvgwBEuUwcMIvR len=0 
' 0018     39 LABEL : Cell Value, String Constant - ahjsQLoqXdwFtZVVTYKQXoPO len=0 
' 0018     52 LABEL : Cell Value, String Constant - aphSzCWyERcwKxjLhgIpHswXxJDVSoLjbXjzP len=0 
' 0018     31 LABEL : Cell Value, String Constant - apJdvqfMUVTYJDKn len=0 
' 0018     31 LABEL : Cell Value, String Constant - apWcvEtZUVTYJCJn len=0 
' 0018     49 LABEL : Cell Value, String Constant - aqtwoNcVFnpKmrFCkxXXyHUvPuTkLkvpIr len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Erro!HB36471 
' 0018     43 LABEL : Cell Value, String Constant - BaBMGYIeOZebmESabkJDgiPVowmS len=0 
' 0018     31 LABEL : Cell Value, String Constant - BbmgyhFoyFBNdszC len=0 
' 0018     18 LABEL : Cell Value, String Constant - BDu len=0 
' 0018     29 LABEL : Cell Value, String Constant - besOQZjeHXpKdX len=0 
' 0018     64 LABEL : Cell Value, String Constant - BFTPxMllMVhKdJgyYyKEWFcMWcYkBQXZiGBegNTmukQLLKPzH len=0 
' 0018     25 LABEL : Cell Value, String Constant - blVUItVrES len=0 
' 0018     57 LABEL : Cell Value, String Constant - bmgyiFozGCNesBCMjeIJpwPXNsnomrdjqHihxnqhHj len=0 
' 0018     55 LABEL : Cell Value, String Constant - bnbZTliFozFCNefBCLjQtJpvPXNsnomrcVdHiTjn len=0 
' 0018     55 LABEL : Cell Value, String Constant - bnCjBmqRFDwOMiEcieqtIefoytXmFZsmcIRSQVGy len=0 
' 0018     53 LABEL : Cell Value, String Constant - BOBnPljMtLwBaBMGYVsOmebmESnbkJEgiPjowm len=0 
' 0018     20 LABEL : Cell Value, String Constant - BOpJo len=0 
' 0018     32 LABEL : Cell Value, String Constant - boyUhVHiFDfNeQUuU len=0 
' 0018     60 LABEL : Cell Value, String Constant - bPYvqUWDXckaGPPNSpwEiuuKORJhwpZHKeHLZWFSrrTbn len=0 
' 0018     53 LABEL : Cell Value, String Constant - bQkaRfpYYLLmuIjEiHYkZWQifDmwDyKbcxzJgN len=0 
' 0018     40 LABEL : Cell Value, String Constant - BqWSSQVHzHlMxNRUMkNscYNhX len=0 
' 0018     49 LABEL : Cell Value, String Constant - bRULkNsqYNhXOcmVVIIjrFgBfEVhWTNfcy len=0 
' 0018     55 LABEL : Cell Value, String Constant - BsRgZJqtOquJFoCbbDLXzTyWoOoztMvSCNSParGO len=0 
' 0018     27 LABEL : Cell Value, String Constant - bwmdrCkkXKkH len=0 
' 0018     23 LABEL : Cell Value, String Constant - bYHuQGwL len=0 
' 0018     29 LABEL : Cell Value, String Constant - bYuRpvrDGVqrCL len=0 
' 0018     36 LABEL : Cell Value, String Constant - BZDhfNCWNDRbKKwxYhtWp len=0 
' 0018     30 LABEL : Cell Value, String Constant - BzQUXOnDvfNPkNR len=0 
' 0018     52 LABEL : Cell Value, String Constant - bzRrSdXpYuepvrDUjqsCZUxzgmGODieechTZg len=0 
' 0018     34 LABEL : Cell Value, String Constant - CbCNHZWsPnfbnEToclJ len=0 
' 0018     62 LABEL : Cell Value, String Constant - CBGdjqVihxBEvUjcNuwRtyMJrFeeGObDXCarSsExQyVFQWS len=0 
' 0018     26 LABEL : Cell Value, String Constant - cHUTjnphHWO len=0 
' 0018     52 LABEL : Cell Value, String Constant - cIGnbwmdrCkkXXyHUvQuTkwlicurOxJPLWnoK len=0 
' 0018     26 LABEL : Cell Value, String Constant - CioIQGlghfk len=0 
' 0018     51 LABEL : Cell Value, String Constant - cjBbaqgjbzdIGncwmdrCkkXXyHUvQuTkwlic len=0 
' 0018     54 LABEL : Cell Value, String Constant - CjmHjnCxhuUUuEQsMrPhHhsmFoLuFLHTkyHIRoj len=0 
' 0018     21 LABEL : Cell Value, String Constant - cjOaap len=0 
' 0018     36 LABEL : Cell Value, String Constant - CkmHjoCyhuUUvERsMrQhI len=0 
' 0018     53 LABEL : Cell Value, String Constant - CkxXXyHTvPuTkKkvpIrOxJPLWnCKLVsnQSyFYg len=0 
' 0018     32 LABEL : Cell Value, String Constant - CLidHJpvPXNsnnmrc len=0 
' 0018     18 LABEL : Cell Value, Stri
... (truncated)

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