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Resubmissions

11/03/2025, 16:25

250311-txbamsxq12 10

10/03/2025, 16:59

250310-vhtzwastaz 10

Analysis

  • max time kernel
    39s
  • max time network
    49s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20250217-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20250217-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    10/03/2025, 16:59

General

  • Target

    cdnmain/chrome.exe

  • Size

    48KB

  • MD5

    560316acf1e4be6ee63f609da37e71b5

  • SHA1

    5f22dcf7736356e24b92397162acb723010914fb

  • SHA256

    44d97fbdb694ca55e3beec4ec031ef5162018bdbaff6a968ac25a21e078511b0

  • SHA512

    38d185d48cf537162ef8302df31cdf723d7407765f21284492345cae914d38ec9e3a6cfee0080b5ff9ebef29f7ac54a505ea2e6fea5d65a60c4e6e1e67fb3361

  • SSDEEP

    768:+BUQgNIL4+M0+LiPLKjwiT8Ybrge09FvEgK/Jw8Vc6KN:+B1gjsPLKTzbUxznkJw8VclN

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

2.58.56.179:2035

Mutex

r4ttlesn4ke_ufog3f8u3egef978

Attributes
  • delay

    1

  • install

    true

  • install_file

    Chrome.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

  • Asyncrat family
  • Async RAT payload 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Delays execution with timeout.exe 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 23 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 10 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\cdnmain\chrome.exe
    "C:\Users\Admin\AppData\Local\Temp\cdnmain\chrome.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1724
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Chrome" /tr '"C:\Users\Admin\AppData\Roaming\Chrome.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4848
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "Chrome" /tr '"C:\Users\Admin\AppData\Roaming\Chrome.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:444
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp901A.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3992
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:4044
      • C:\Users\Admin\AppData\Roaming\Chrome.exe
        "C:\Users\Admin\AppData\Roaming\Chrome.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:1340

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Chrome.exe.log

    Filesize

    425B

    MD5

    822f6384df6d1671168631e912dd7a4c

    SHA1

    972aacac112d14ea63c9d33b57ecd402e67a5f19

    SHA256

    5f50faf2e5bbac2ce5423530952c977e965d60dfb6920a5cce5a707bac630bc4

    SHA512

    3c03b3c90b551c7febce56406b48e5e4022e7128bfd3a283ec0e3dd952575649af3428b514fb8a312358eb643d3a4f3f4f747a16c29b8863f5367fffe11a9fbf

  • C:\Users\Admin\AppData\Local\Temp\tmp901A.tmp.bat

    Filesize

    150B

    MD5

    eba00d08e792dc34afc75d53942d590e

    SHA1

    a3552737a9b1f28adcf228a7853450f75ef07018

    SHA256

    8758046bad501bd0f0086c31829b6b983d5004152308b8bfd63357ad16d5208e

    SHA512

    f35a432b8f8394b87e93314636650639dacae23799a5fed5e899fc9a5aac479cec33ef81b45f78697c8cc47dd10f138a86ebe0065d0eb93f6b738eed287657fb

  • C:\Users\Admin\AppData\Roaming\Chrome.exe

    Filesize

    48KB

    MD5

    560316acf1e4be6ee63f609da37e71b5

    SHA1

    5f22dcf7736356e24b92397162acb723010914fb

    SHA256

    44d97fbdb694ca55e3beec4ec031ef5162018bdbaff6a968ac25a21e078511b0

    SHA512

    38d185d48cf537162ef8302df31cdf723d7407765f21284492345cae914d38ec9e3a6cfee0080b5ff9ebef29f7ac54a505ea2e6fea5d65a60c4e6e1e67fb3361

  • memory/1724-0-0x00007FFC580B3000-0x00007FFC580B5000-memory.dmp

    Filesize

    8KB

  • memory/1724-1-0x0000000000C90000-0x0000000000CA2000-memory.dmp

    Filesize

    72KB

  • memory/1724-2-0x00007FFC580B0000-0x00007FFC58B72000-memory.dmp

    Filesize

    10.8MB

  • memory/1724-7-0x00007FFC580B0000-0x00007FFC58B72000-memory.dmp

    Filesize

    10.8MB