asyncrat | ea04850fa21b0c32d74e4f6dfd09540efb4674cb64e6836b4842d8a7e6ae587a

Resubmissions

08/08/2023, 23:35

230808-3lgsqahh4x10

08/08/2023, 01:29

230808-bv85sabe9x10

Analysis

max time kernel
146s
max time network
125s
platform
windows7_x64
resource
win7-20230712-en
resource tags

arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
submitted
08/08/2023, 01:29

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General

Target
65c06c0404ce69f08491b0f868e0b635.exe
Size 45KB
Sample230808-bv85sabe9x
SHA256 ea04850fa21b0c32d74e4f6dfd09540efb4674cb64e6836b4842d8a7e6ae587a
MD5 65c06c0404ce69f08491b0f868e0b635
SHA1 1755e9e23b212c625fd2abe28ddd8255417bdc59
SHA512 e10163f69abe54bc2fe725879ff1fcfa44b17048b5ab92793c18e0ed74dcf9e27bf273bfe22f5847a1da4abed8d27d59258116d678d37c5e05827f54bcf6eea6
SSDEEP 768:jujYm1TUET1/WUTQV9mo2qz+8V1vBTcPI1zjbkgX3iKKeS6XGdmLhufvfBDZ/x:jujYm1TU0I2P8VnTh13brXSR+iyGvpdp
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

127.0.0.1:6606
127.0.0.1:7707
127.0.0.1:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
UpdateHost.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 5 IoCs

rat

resource	yara_rule
behavioral1/memory/2124-54-0x0000000000160000-0x0000000000172000-memory.dmp	asyncrat
behavioral1/files/0x0008000000012026-67.dat	asyncrat
behavioral1/files/0x0008000000012026-68.dat	asyncrat
behavioral1/files/0x0008000000012026-69.dat	asyncrat
behavioral1/memory/3012-70-0x0000000001320000-0x0000000001332000-memory.dmp	asyncrat

Executes dropped EXE 1 IoCs

pid	Process
3012	UpdateHost.exe

Loads dropped DLL 1 IoCs

pid	Process
1156	cmd.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2852	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2856	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2124	65c06c0404ce69f08491b0f868e0b635.exe
2124	65c06c0404ce69f08491b0f868e0b635.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2124	65c06c0404ce69f08491b0f868e0b635.exe
Token: SeDebugPrivilege	3012	UpdateHost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2124 wrote to memory of 2104	2124	65c06c0404ce69f08491b0f868e0b635.exe	28
PID 2124 wrote to memory of 2104	2124	65c06c0404ce69f08491b0f868e0b635.exe	28
PID 2124 wrote to memory of 2104	2124	65c06c0404ce69f08491b0f868e0b635.exe	28
PID 2124 wrote to memory of 2104	2124	65c06c0404ce69f08491b0f868e0b635.exe	28
PID 2124 wrote to memory of 1156	2124	65c06c0404ce69f08491b0f868e0b635.exe	30
PID 2124 wrote to memory of 1156	2124	65c06c0404ce69f08491b0f868e0b635.exe	30
PID 2124 wrote to memory of 1156	2124	65c06c0404ce69f08491b0f868e0b635.exe	30
PID 2124 wrote to memory of 1156	2124	65c06c0404ce69f08491b0f868e0b635.exe	30
PID 1156 wrote to memory of 2856	1156	cmd.exe	33
PID 1156 wrote to memory of 2856	1156	cmd.exe	33
PID 1156 wrote to memory of 2856	1156	cmd.exe	33
PID 1156 wrote to memory of 2856	1156	cmd.exe	33
PID 2104 wrote to memory of 2852	2104	cmd.exe	32
PID 2104 wrote to memory of 2852	2104	cmd.exe	32
PID 2104 wrote to memory of 2852	2104	cmd.exe	32
PID 2104 wrote to memory of 2852	2104	cmd.exe	32
PID 1156 wrote to memory of 3012	1156	cmd.exe	34
PID 1156 wrote to memory of 3012	1156	cmd.exe	34
PID 1156 wrote to memory of 3012	1156	cmd.exe	34
PID 1156 wrote to memory of 3012	1156	cmd.exe	34
PID 1156 wrote to memory of 3012	1156	cmd.exe	34
PID 1156 wrote to memory of 3012	1156	cmd.exe	34
PID 1156 wrote to memory of 3012	1156	cmd.exe	34

C:\Users\Admin\AppData\Local\Temp\65c06c0404ce69f08491b0f868e0b635.exe
"C:\Users\Admin\AppData\Local\Temp\65c06c0404ce69f08491b0f868e0b635.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2124
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "UpdateHost" /tr '"C:\Users\Admin\AppData\Roaming\UpdateHost.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2104
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "UpdateHost" /tr '"C:\Users\Admin\AppData\Roaming\UpdateHost.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:2852
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp9109.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1156
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2856
- - C:\Users\Admin\AppData\Roaming\UpdateHost.exe
    "C:\Users\Admin\AppData\Roaming\UpdateHost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3012

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

tmp9109.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp9109.tmp.bat
Size 154B
SHA256 528ca5c4ffd840afce8b3ba59e431d9205410e8ff21e7fb0e9a801811bd21e0b
MD5 b36b0e87d9dff8bf2b71905da06095b3
SHA1 ac546da7ffd7d0f8db15e63f62ea0020343ca09e
SHA512 1d3e1d946a6dd590f72e6f05a48ff3cde436ba0288f2b040272a44ef8e94e2b3d0913119e3aaf65dd9c93bd3683c18f1d4f6bd1ca798401941978e4e69368fd0
MD5 SHA1 SHA512

Submit Download

tmp9109.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp9109.tmp.bat
Size 154B
SHA256 528ca5c4ffd840afce8b3ba59e431d9205410e8ff21e7fb0e9a801811bd21e0b
MD5 b36b0e87d9dff8bf2b71905da06095b3
SHA1 ac546da7ffd7d0f8db15e63f62ea0020343ca09e
SHA512 1d3e1d946a6dd590f72e6f05a48ff3cde436ba0288f2b040272a44ef8e94e2b3d0913119e3aaf65dd9c93bd3683c18f1d4f6bd1ca798401941978e4e69368fd0
MD5 SHA1 SHA512

Submit Download

UpdateHost.exe

Path C:\Users\Admin\AppData\Roaming\UpdateHost.exe
Size 45KB
SHA256 ea04850fa21b0c32d74e4f6dfd09540efb4674cb64e6836b4842d8a7e6ae587a
MD5 65c06c0404ce69f08491b0f868e0b635
SHA1 1755e9e23b212c625fd2abe28ddd8255417bdc59
SHA512 e10163f69abe54bc2fe725879ff1fcfa44b17048b5ab92793c18e0ed74dcf9e27bf273bfe22f5847a1da4abed8d27d59258116d678d37c5e05827f54bcf6eea6
SSDEEP 768:jujYm1TUET1/WUTQV9mo2qz+8V1vBTcPI1zjbkgX3iKKeS6XGdmLhufvfBDZ/x:jujYm1TU0I2P8VnTh13brXSR+iyGvpdp
MD5 SHA1 SHA512 SSDEEP

Submit Download

UpdateHost.exe

Path C:\Users\Admin\AppData\Roaming\UpdateHost.exe
Size 45KB
SHA256 ea04850fa21b0c32d74e4f6dfd09540efb4674cb64e6836b4842d8a7e6ae587a
MD5 65c06c0404ce69f08491b0f868e0b635
SHA1 1755e9e23b212c625fd2abe28ddd8255417bdc59
SHA512 e10163f69abe54bc2fe725879ff1fcfa44b17048b5ab92793c18e0ed74dcf9e27bf273bfe22f5847a1da4abed8d27d59258116d678d37c5e05827f54bcf6eea6
SSDEEP 768:jujYm1TUET1/WUTQV9mo2qz+8V1vBTcPI1zjbkgX3iKKeS6XGdmLhufvfBDZ/x:jujYm1TU0I2P8VnTh13brXSR+iyGvpdp
MD5 SHA1 SHA512 SSDEEP

Submit Download

UpdateHost.exe

Path \Users\Admin\AppData\Roaming\UpdateHost.exe
Size 45KB
SHA256 ea04850fa21b0c32d74e4f6dfd09540efb4674cb64e6836b4842d8a7e6ae587a
MD5 65c06c0404ce69f08491b0f868e0b635
SHA1 1755e9e23b212c625fd2abe28ddd8255417bdc59
SHA512 e10163f69abe54bc2fe725879ff1fcfa44b17048b5ab92793c18e0ed74dcf9e27bf273bfe22f5847a1da4abed8d27d59258116d678d37c5e05827f54bcf6eea6
SSDEEP 768:jujYm1TUET1/WUTQV9mo2qz+8V1vBTcPI1zjbkgX3iKKeS6XGdmLhufvfBDZ/x:jujYm1TU0I2P8VnTh13brXSR+iyGvpdp
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2124-66-0x0000000074A00000-0x00000000750EE000-memory.dmp

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memory/2124-54-0x0000000000160000-0x0000000000172000-memory.dmp

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memory/2124-56-0x0000000004C00000-0x0000000004C40000-memory.dmp

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memory/2124-55-0x0000000074A00000-0x00000000750EE000-memory.dmp

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memory/3012-70-0x0000000001320000-0x0000000001332000-memory.dmp

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memory/3012-71-0x00000000749E0000-0x00000000750CE000-memory.dmp

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memory/3012-72-0x0000000000E70000-0x0000000000EB0000-memory.dmp

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memory/3012-73-0x00000000749E0000-0x00000000750CE000-memory.dmp

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memory/3012-74-0x0000000000E70000-0x0000000000EB0000-memory.dmp

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