asyncrat | 94d46e8b9788023fe37638002c39e84c3f00c473e69eb8a48efc4f4c058ff100

General

Target

lec.exe
Size

262KB
MD5

6afe340c4109d4dc85f4816047d7e036
SHA1

f1895f5c5e735ad4164f089567907350f4a0e093
SHA256

94d46e8b9788023fe37638002c39e84c3f00c473e69eb8a48efc4f4c058ff100
SHA512

9d0149848d18c3637d64b20457df098d2adf5f9d50ea4d591fa266d08083e253c9b81ae0aea8c930331aa32d992060817ccceda4a9fbb5e2b487a605e649ba50
SSDEEP

3072:STMdJz1z8Ub7OPk6JEYZTuSEzvi0oqn/YX+hYz:HdPbyPFEYZTuSEzvHvnAOS

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

Attributes

delay
1
install
true
install_file
update.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/7FziSYnf

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000a00000001202a-15.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2024	update.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

flow	ioc
4	pastebin.com
5	pastebin.com
6	6.tcp.eu.ngrok.io

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 2 IoCs

evasion

pid	Process
2896	timeout.exe
1304	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2840	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2348	lec.exe
2348	lec.exe
2348	lec.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2348	lec.exe
Token: SeDebugPrivilege	2348	lec.exe
Token: SeDebugPrivilege	2024	update.exe
Token: SeDebugPrivilege	2024	update.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2348 wrote to memory of 2412	2348	lec.exe	31
PID 2348 wrote to memory of 2412	2348	lec.exe	31
PID 2348 wrote to memory of 2412	2348	lec.exe	31
PID 2348 wrote to memory of 1856	2348	lec.exe	33
PID 2348 wrote to memory of 1856	2348	lec.exe	33
PID 2348 wrote to memory of 1856	2348	lec.exe	33
PID 2412 wrote to memory of 2840	2412	cmd.exe	35
PID 2412 wrote to memory of 2840	2412	cmd.exe	35
PID 2412 wrote to memory of 2840	2412	cmd.exe	35
PID 1856 wrote to memory of 2896	1856	cmd.exe	36
PID 1856 wrote to memory of 2896	1856	cmd.exe	36
PID 1856 wrote to memory of 2896	1856	cmd.exe	36
PID 1856 wrote to memory of 2024	1856	cmd.exe	37
PID 1856 wrote to memory of 2024	1856	cmd.exe	37
PID 1856 wrote to memory of 2024	1856	cmd.exe	37
PID 2024 wrote to memory of 1572	2024	update.exe	39
PID 2024 wrote to memory of 1572	2024	update.exe	39
PID 2024 wrote to memory of 1572	2024	update.exe	39
PID 2024 wrote to memory of 2984	2024	update.exe	41
PID 2024 wrote to memory of 2984	2024	update.exe	41
PID 2024 wrote to memory of 2984	2024	update.exe	41
PID 2984 wrote to memory of 1304	2984	cmd.exe	43
PID 2984 wrote to memory of 1304	2984	cmd.exe	43
PID 2984 wrote to memory of 1304	2984	cmd.exe	43
PID 1572 wrote to memory of 996	1572	cmd.exe	44
PID 1572 wrote to memory of 996	1572	cmd.exe	44
PID 1572 wrote to memory of 996	1572	cmd.exe	44

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.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\lec.exe
"C:\Users\Admin\AppData\Local\Temp\lec.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2348
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Roaming\update.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2412
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Roaming\update.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2840
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpA860.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1856
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2896
- - C:\Users\Admin\AppData\Roaming\update.exe
    "C:\Users\Admin\AppData\Roaming\update.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2024
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "update"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1572
    - - C:\Windows\system32\schtasks.exe
        
        schtasks /delete /f /tn "update"
        5⤵
        
        PID:996
  - - C:\Windows\system32\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp3AC7.tmp.bat""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2984
    - - C:\Windows\system32\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:1304

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\CabC841.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar399C.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp3AC7.tmp.bat

Filesize
155B

MD5
e3fc8d694a12e052d200b2611cb78c6f

SHA1
67fb58b9a3621a1f5db09f1913c6e38a5113776e

SHA256
501ddfdd47ea5ce6a45483594c8274b7d139a5ae6de042b9dddcdde40237269f

SHA512
2e21c4fa57ba1a38cf7003a7b63ce661c5853c07c8a5f3abc32c0cafc395ea356de988408f74cec71195d57b091694e6d61d2ae3960373be79590bab7e4e3dbb

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA860.tmp.bat

Filesize
150B

MD5
56f87a7b2dcb59d3ca8fd6bcac4997ca

SHA1
01e00b066af358c168bc86dfa9f26bb2ee719d41

SHA256
a7dc0c9e2c66d4ad87d1f19eb885c63a98f176191dbbaa696f3300b8a16ec9f3

SHA512
fb9a523d5979fc000766698c98e7403df23e368b23d73eaa13e66379fe5243960913461eafc3df4e8fc8e1fb634469a5233dfc2df2e73241723ffa72eb00986f

Download Submit
C:\Users\Admin\AppData\Roaming\update.exe

Filesize
262KB

MD5
6afe340c4109d4dc85f4816047d7e036

SHA1
f1895f5c5e735ad4164f089567907350f4a0e093

SHA256
94d46e8b9788023fe37638002c39e84c3f00c473e69eb8a48efc4f4c058ff100

SHA512
9d0149848d18c3637d64b20457df098d2adf5f9d50ea4d591fa266d08083e253c9b81ae0aea8c930331aa32d992060817ccceda4a9fbb5e2b487a605e649ba50

Download Submit
memory/2024-17-0x00000000001D0000-0x0000000000218000-memory.dmp

Filesize
288KB

Download
memory/2024-35-0x000000001B4B0000-0x000000001B562000-memory.dmp

Filesize
712KB

Download
memory/2348-0-0x000007FEF5AC3000-0x000007FEF5AC4000-memory.dmp

Filesize
4KB

Download
memory/2348-1-0x00000000008D0000-0x0000000000918000-memory.dmp

Filesize
288KB

Download
memory/2348-2-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

Filesize
9.9MB

Download
memory/2348-3-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

Filesize
9.9MB

Download
memory/2348-13-0x000007FEF5AC0000-0x000007FEF64AC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads