Analysis

  • max time kernel
    77s
  • max time network
    82s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/03/2023, 14:35

General

  • Target
    Client.exe
  • Size 63KB
  • Sample230314-rx7mqsaa3v
  • SHA256 696bb916175fb1aef752175c808ffdb52e7aabaa18406790cc78cb0e35c5b00a
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10

Malware Config

Extracted

Family
  • asyncrat

Version
  • 1.0.7

Botnet
  • Default

Mutex
  • DcRatMutex_qwqdanchun

Attributes
  • delay

    1

  • install

    false

  • install_file

    csrss.exe

  • install_folder

    %AppData%

  • pastebin_config

    https://pastebin.com/raw/3Z9zi18j

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Async RAT payload 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Checks processor information in registry 2 TTPs 5 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies registry class 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 4 IoCs
  • Suspicious use of SendNotifyMessage 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client.exe
    "C:\Users\Admin\AppData\Local\Temp\Client.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4888
  • C:\Program Files\Mozilla Firefox\firefox.exe
    "C:\Program Files\Mozilla Firefox\firefox.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3356
    • C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe"
      2⤵
      • Checks processor information in registry
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1700
      • C:\Program Files\Mozilla Firefox\firefox.exe
        "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.0.1263087912\420802723" -parentBuildID 20221007134813 -prefsHandle 1836 -prefMapHandle 1828 -prefsLen 20890 -prefMapSize 232675 -appDir "C:\Program Files\Mozilla Firefox\browser" - {fa87dbd6-8ccf-4c03-a045-ce4ab43936bb} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 1932 28a778e6b58 gpu
        3⤵
          PID:2096
        • C:\Program Files\Mozilla Firefox\firefox.exe
          "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.1.168258592\841866570" -parentBuildID 20221007134813 -prefsHandle 2304 -prefMapHandle 2300 -prefsLen 20926 -prefMapSize 232675 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {ecd62d2c-c81d-48ca-a4aa-1997b5f9c934} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 2316 28a6a870d58 socket
          3⤵
            PID:4400
          • C:\Program Files\Mozilla Firefox\firefox.exe
            "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.2.800509544\180503019" -childID 1 -isForBrowser -prefsHandle 3116 -prefMapHandle 3132 -prefsLen 21074 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {28085626-0475-476d-9315-acec0f67c287} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 3104 28a77869058 tab
            3⤵
              PID:3836
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.3.228657866\712001631" -childID 2 -isForBrowser -prefsHandle 3720 -prefMapHandle 3716 -prefsLen 26519 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {163a1313-0d30-447b-8f90-25bdfa96d0b1} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 3732 28a7c18be58 tab
              3⤵
                PID:4960
              • C:\Program Files\Mozilla Firefox\firefox.exe
                "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.4.25942824\1426751864" -childID 3 -isForBrowser -prefsHandle 4712 -prefMapHandle 4692 -prefsLen 26659 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {ad5a15c8-ed12-410e-9116-d3ed959a1387} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 4724 28a7d854858 tab
                3⤵
                  PID:812
                • C:\Program Files\Mozilla Firefox\firefox.exe
                  "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.5.338390302\1855585430" -childID 4 -isForBrowser -prefsHandle 4908 -prefMapHandle 4948 -prefsLen 26659 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {4f6a95a2-820f-4f51-bf5b-ae8b5b06614c} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 4932 28a7ebf1c58 tab
                  3⤵
                    PID:5352
                  • C:\Program Files\Mozilla Firefox\firefox.exe
                    "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.8.1257062245\1632274689" -childID 7 -isForBrowser -prefsHandle 5584 -prefMapHandle 5588 -prefsLen 26659 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {fe213d27-4cc0-4a5f-8293-a9a37fc97b31} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 5576 28a7f67a558 tab
                    3⤵
                      PID:5392
                    • C:\Program Files\Mozilla Firefox\firefox.exe
                      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.7.1997433784\440852495" -childID 6 -isForBrowser -prefsHandle 5400 -prefMapHandle 5404 -prefsLen 26659 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {ecaf9f35-ffdd-47fd-82e6-818e1895e21a} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 5392 28a7f67b158 tab
                      3⤵
                        PID:5380
                      • C:\Program Files\Mozilla Firefox\firefox.exe
                        "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.6.1638817554\204013080" -childID 5 -isForBrowser -prefsHandle 5208 -prefMapHandle 5212 -prefsLen 26659 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {113e2e5d-9968-4221-9ee5-5e1d51f96fe2} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 5196 28a7f67ba58 tab
                        3⤵
                          PID:5364
                        • C:\Program Files\Mozilla Firefox\firefox.exe
                          "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="1700.9.1702006629\2019685208" -childID 8 -isForBrowser -prefsHandle 4932 -prefMapHandle 5168 -prefsLen 26851 -prefMapSize 232675 -jsInitHandle 1460 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {bd23f740-2b69-47f0-a3e7-192482010edd} 1700 "\\.\pipe\gecko-crash-server-pipe.1700" 5876 28a7cbce358 tab
                          3⤵
                            PID:2456

                      Network

                            MITRE ATT&CK Enterprise v6

                            Replay Monitor

                            Loading Replay Monitor...

                            Downloads

                            activity-stream.discovery_stream.json.tmp

                            • Path C:\Users\Admin\AppData\Local\Mozilla\Firefox\Profiles\85w5cth6.default-release\activity-stream.discovery_stream.json.tmp
                            • Size 160KB
                            • SHA256 ea3edd38258bbe0a642f6036051c368a781bbd0c56c238225bedf3fe7230ad75
                            • MD5 SHA1 SHA512 SSDEEP

                            184C843EA0B8CD10730CA2564A233632E40FEF45

                            • Path C:\Users\Admin\AppData\Local\Mozilla\Firefox\Profiles\85w5cth6.default-release\cache2\entries\184C843EA0B8CD10730CA2564A233632E40FEF45
                            • Size 14KB
                            • SHA256 bfb1c959d33f8e7c3bd2839ec4846b4b03ac07a365128ffcc6199926f81d8467
                            • MD5 SHA1 SHA512 SSDEEP

                            tmpaddon

                            • Path C:\Users\Admin\AppData\Local\Temp\tmpaddon
                            • Size 442KB
                            • SHA256 a9f4281f82b3579581c389e8583dc9f477c7fd0e20c9dfc91a2e611e21e3407e
                            • MD5 SHA1 SHA512 SSDEEP

                            tmpaddon-1

                            • Path C:\Users\Admin\AppData\Local\Temp\tmpaddon-1
                            • Size 2.0MB
                            • SHA256 895e3fcd4c46d4ca054da5da3472112bbc9dbc3e8ef3d452628373f546b16ad5
                            • MD5 SHA1 SHA512 SSDEEP

                            gmpopenh264.dll

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\gmp-gmpopenh264\1.8.1.2\gmpopenh264.dll
                            • Size 997KB
                            • SHA256 1ed7877024be63a049da98733fd282c16bd620530a4fb580dacec3a78ace914e
                            • MD5 SHA1 SHA512 SSDEEP

                            gmpopenh264.info

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\gmp-gmpopenh264\1.8.1.2\gmpopenh264.info
                            • Size 116B
                            • SHA256 f526e9f98841d987606efeaff7f3e017ba9fd516c4be83890c7f9a093ea4c47b
                            • MD5 SHA1 SHA512

                            LICENSE.txt

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\gmp-widevinecdm\4.10.2557.0\LICENSE.txt
                            • Size 479B
                            • SHA256 2af127b4e00f7303de8271996c0c681063e4dc7abdc7b2a8c3fe5932b9352539
                            • MD5 SHA1 SHA512

                            manifest.json

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\gmp-widevinecdm\4.10.2557.0\manifest.json
                            • Size 372B
                            • SHA256 e92d3394635edfb987a7528e0ccd24360e07a299078df2a6967ca3aae22fa2dd
                            • MD5 SHA1 SHA512

                            widevinecdm.dll

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\gmp-widevinecdm\4.10.2557.0\widevinecdm.dll
                            • Size 1.7MB
                            • SHA256 af198d81911590893ee414d0035b579c0994c43f6944076eeca0cd39216b4ceb
                            • MD5 SHA1 SHA512 SSDEEP

                            widevinecdm.dll.lib

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\gmp-widevinecdm\4.10.2557.0\widevinecdm.dll.lib
                            • Size 1KB
                            • SHA256 33899a3ebc22cb8ed8de7bd48c1c29486c0279b06d7ef98241c92aef4e3b9237
                            • MD5 SHA1 SHA512

                            widevinecdm.dll.sig

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\gmp-widevinecdm\4.10.2557.0\widevinecdm.dll.sig
                            • Size 1KB
                            • SHA256 68a03f075db104f84afdd8fca45a7e4bff7b55dc1a2a24272b3abe16d8759c81
                            • MD5 SHA1 SHA512

                            prefs-1.js

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\prefs-1.js
                            • Size 6KB
                            • SHA256 0b1c38e67f3b384ca4e72f3edfbef767f61e82fa94c8a71198fabb65fd988198
                            • MD5 SHA1 SHA512 SSDEEP

                            prefs-1.js

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\prefs-1.js
                            • Size 8KB
                            • SHA256 e2933c203bfdc526ea1fd513b959d1ecb5d30dc04848970928edcd41128c7572
                            • MD5 SHA1 SHA512 SSDEEP

                            prefs-1.js

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\prefs-1.js
                            • Size 6KB
                            • SHA256 9845c745814cfce23c44eeffff8f4942e795675f08f0f8c630e8bd7e9d0aa958
                            • MD5 SHA1 SHA512 SSDEEP

                            prefs-1.js

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\prefs-1.js
                            • Size 6KB
                            • SHA256 372c4806bb28ced3e0a0392afa77f86d7668ac61e58c4f4ea1866f6775a7269d
                            • MD5 SHA1 SHA512 SSDEEP

                            prefs.js

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\prefs.js
                            • Size 6KB
                            • SHA256 fc898a91ae8ce9d241c586f5dee2e60450dcdc5a31f1a7015d6dc2f4fefe4ac7
                            • MD5 SHA1 SHA512 SSDEEP

                            recovery.jsonlz4

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\sessionstore-backups\recovery.jsonlz4
                            • Size 1KB
                            • SHA256 4b35bb7b7e899e0a3fa67ba7f2fb05669f742a62992b9c3ee092a3d1f85d3631
                            • MD5 SHA1 SHA512

                            recovery.jsonlz4

                            • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\85w5cth6.default-release\sessionstore-backups\recovery.jsonlz4
                            • Size 2KB
                            • SHA256 8a23625a81693c070c1d02e68b15549e11b2c0562dff2cbacb1ea5525432f4d3
                            • MD5 SHA1 SHA512

                            memory/4888-133-0x00000000001F0000-0x0000000000206000-memory.dmp

                            memory/4888-137-0x0000000000B70000-0x0000000000B8E000-memory.dmp

                            memory/4888-136-0x000000001D680000-0x000000001D6F6000-memory.dmp

                            memory/4888-135-0x0000000000960000-0x0000000000970000-memory.dmp

                            memory/4888-134-0x0000000000960000-0x0000000000970000-memory.dmp