Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    02-11-2024 03:58

General

  • Target

    Big clean script.exe

  • Size

    230KB

  • MD5

    b23d20593d9176d95302568243f60052

  • SHA1

    fef1aa01b7a41a8255d71309c7c5badf48a7a907

  • SHA256

    9ff459396b1f4de8dbca8a866ff3b9e4a46c48a9dc1071812a256fe21349caf9

  • SHA512

    13a9f86ca7b7df87b4174875fb3d7a7552986a6484297c841037b054d3bf01eab724f3b080f9f1984cc58912e0a50953f5d1e2355dca1cc5366eca4870400d3e

  • SSDEEP

    6144:lloZM+rIkd8g+EtXHkv/iD4M8RobhS6FDAxDeebSzb8e1muQTSi:noZtL+EP8M8RobhS6FDAxDeebIHQz

Malware Config

Signatures

  • Detect Umbral payload 1 IoCs
  • Umbral

    Umbral stealer is an opensource moduler stealer written in C#.

  • Umbral family
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 63 IoCs
  • Suspicious use of FindShellTrayWindow 35 IoCs
  • Suspicious use of SendNotifyMessage 32 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Big clean script.exe
    "C:\Users\Admin\AppData\Local\Temp\Big clean script.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2516
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1704
  • C:\Program Files\Google\Chrome\Application\chrome.exe
    "C:\Program Files\Google\Chrome\Application\chrome.exe"
    1⤵
    • Enumerates system info in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:2200
    • C:\Program Files\Google\Chrome\Application\chrome.exe
      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" --url=https://clients2.google.com/cr/report --annotation=channel= --annotation=plat=Win64 --annotation=prod=Chrome --annotation=ver=106.0.5249.119 --initial-client-data=0xc0,0xc4,0xc8,0x94,0xcc,0x7fef7819758,0x7fef7819768,0x7fef7819778
      2⤵
        PID:2828
      • C:\Program Files\Google\Chrome\Application\chrome.exe
        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=1200 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:2
        2⤵
          PID:2780
        • C:\Program Files\Google\Chrome\Application\chrome.exe
          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=1556 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:8
          2⤵
            PID:2608
          • C:\Program Files\Google\Chrome\Application\chrome.exe
            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=1644 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:8
            2⤵
              PID:2640
            • C:\Program Files\Google\Chrome\Application\chrome.exe
              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --first-renderer-process --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --mojo-platform-channel-handle=2296 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:1
              2⤵
                PID:1824
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2352 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:1
                2⤵
                  PID:1196
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --use-gl=angle --use-angle=swiftshader-webgl --mojo-platform-channel-handle=1280 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:2
                  2⤵
                    PID:1720
                  • C:\Program Files\Google\Chrome\Application\chrome.exe
                    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --disable-gpu-compositing --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=8 --mojo-platform-channel-handle=2880 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:1
                    2⤵
                      PID:1176
                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=3252 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:8
                      2⤵
                        PID:2112
                      • C:\Program Files\Google\Chrome\Application\chrome.exe
                        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --mojo-platform-channel-handle=3580 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:8
                        2⤵
                          PID:1616
                        • C:\Program Files\Google\Chrome\Application\chrome.exe
                          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=3760 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:8
                          2⤵
                            PID:2312
                          • C:\Program Files\Google\Chrome\Application\chrome.exe
                            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --disable-gpu-compositing --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=12 --mojo-platform-channel-handle=3704 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:1
                            2⤵
                              PID:1432
                            • C:\Program Files\Google\Chrome\Application\chrome.exe
                              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --disable-gpu-compositing --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=13 --mojo-platform-channel-handle=3900 --field-trial-handle=1268,i,11174113301402070441,17326205794461211189,131072 /prefetch:1
                              2⤵
                                PID:1040
                            • C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
                              "C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe"
                              1⤵
                                PID:1112

                              Network

                              MITRE ATT&CK Enterprise v15

                              Replay Monitor

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                              Downloads

                              • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GPUCache\data_1

                                Filesize

                                264KB

                                MD5

                                f50f89a0a91564d0b8a211f8921aa7de

                                SHA1

                                112403a17dd69d5b9018b8cede023cb3b54eab7d

                                SHA256

                                b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

                                SHA512

                                bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

                              • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences

                                Filesize

                                5KB

                                MD5

                                5788476cbd28c14cdf7ee9f1841185a5

                                SHA1

                                26e4dfc834c385999ecb66d2236b12997619d5a0

                                SHA256

                                51967ed96de32908b99d1072dfcd02afaabf9d54c0832ce4a03698f772c36871

                                SHA512

                                f6e80d30b8f4afbbf47437c3506f0d46f16237cf4f61f4f93e14eba5ef6f87796bc2c84af8c444d679afc9dd9eca833adea3755bc7176834f184cdbdad09ba86

                              • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Sync Data\LevelDB\000007.dbtmp

                                Filesize

                                16B

                                MD5

                                18e723571b00fb1694a3bad6c78e4054

                                SHA1

                                afcc0ef32d46fe59e0483f9a3c891d3034d12f32

                                SHA256

                                8af72f43857550b01eab1019335772b367a17a9884a7a759fdf4fe6f272b90aa

                                SHA512

                                43bb0af7d3984012d2d67ca6b71f0201e5b948e6fe26a899641c4c6f066c59906d468ddf7f1df5ea5fa33c2bc5ea8219c0f2c82e0a5c365ad7581b898a8859e2

                              • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State

                                Filesize

                                335KB

                                MD5

                                6a66db9f110a63b83a4181f3c67c3099

                                SHA1

                                9dde5e2ef8ad1685592e9d324d9ddbadefd21031

                                SHA256

                                d79a4169395e0d287f401e7e25e30ab192254b1e31e438a967b29f034f4eba27

                                SHA512

                                b33d0e3870ad7c6156fcf184c17a4de228781757e61e14d5d3e779f8515040a02b4668cdc67c8a7968906f4159054a114dc44b5a9d851b1d37481b3529c69d4b

                              • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State

                                Filesize

                                345KB

                                MD5

                                b6cd216516d41ae6986c6110a7560c44

                                SHA1

                                738d7e30ba73df37d3ab35b402033772705a2587

                                SHA256

                                751dfdecdaae87449787ce3c921bfeb176fe11407a36dd71cf6a253235ecd705

                                SHA512

                                339ce4eb84d7eef2330d9a85ab434bcc2f320858739dcc18fa8e45204e550d72900004297f5dea6a794b4eea219df0df3679128ca0714709eeffd73a2de51ee7

                              • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\c9d9d695-20d1-4c24-aa83-92420447e49a.tmp

                                Filesize

                                345KB

                                MD5

                                78960bb7bc1d8200da57c0077c2af0fd

                                SHA1

                                a1bd710f0ccedfd074f3a8c3f099c8c8157c2656

                                SHA256

                                a8d30f87e0e2b0ed4cce56b283b79b57bf6faa28d76f8a3e0c297ef23789891e

                                SHA512

                                7f840e4b25e86990c80537716b2a41a3978f1802586a409a35e99d9f7050a273486e428dce7b07a2e774d82acfcd82f2253fda2720254e77023e8eff9183d0b9

                              • memory/2516-0-0x000007FEF6313000-0x000007FEF6314000-memory.dmp

                                Filesize

                                4KB

                              • memory/2516-1-0x0000000000C50000-0x0000000000C90000-memory.dmp

                                Filesize

                                256KB

                              • memory/2516-2-0x000007FEF6310000-0x000007FEF6CFC000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2516-3-0x000007FEF6310000-0x000007FEF6CFC000-memory.dmp

                                Filesize

                                9.9MB