asyncrat | eef6b84f963cbc03178aaa926c6daa1c10eef19db60a98e3395e15f42f87ecdf

General

Target
sanami.exe
Size 47KB
Sample260804-kagdpsverb
SHA256 eef6b84f963cbc03178aaa926c6daa1c10eef19db60a98e3395e15f42f87ecdf
MD5 5e6f4841183dbeb70751dcaba195ba35
SHA1 fee0683eca1499174b777a8f83b4b17162c37999
SHA512 44b619f2aed9384d5077320028ba2cbf8621c81c3c51c9e64458f60754e036ecc11a4bab3c29e7b3beb08dc17401b009a55af430244722ca8152c1e08cf1d755
SSDEEP 768:MuQqNTvEEaBrWUXFd5mo2qmiUh/knpHzxPIUUN//0bcAgSIGt2+ZjOMUbOMVX1WL:MuQqNT8572xFhMnpHSUUNkbPgqt2+NOI
TLSH
T1D4232B0037E98126F2BF4F74ADF33145867AB2676602D65E1CC441971B23FC69A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

98win.ceo command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

98win.ceo

C2

98win.ceo:6606
98win.ceo:80
98win.ceo:8080
98win.ceo:443
98win.ceo:8443
98win.ceo:22
98win.ceo:23

Mutex

ICooFwNLyud9

Attributes

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

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x0003000000023339-9.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	sanami.exe

Executes dropped EXE 2 IoCs

pid	Process
5696	GoogleUpdate.exe
6064	GoogleUpdate.exe

Outbound SSH connection to public host 2 TTPs 1 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc	pid	Process
SSH destination	16	104.21.95.129:22	5696	GoogleUpdate.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3996	cmd.exe
4724	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	GoogleUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	GoogleUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sanami.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5800	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
3400	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe
5808	sanami.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5808	sanami.exe
Token: SeDebugPrivilege	5696	GoogleUpdate.exe
Token: SeDebugPrivilege	5696	GoogleUpdate.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5808 wrote to memory of 3996	5808	sanami.exe	87
PID 5808 wrote to memory of 4724	5808	sanami.exe	89
PID 4724 wrote to memory of 5800	4724	cmd.exe	91
PID 3996 wrote to memory of 3400	3996	cmd.exe	92
PID 4724 wrote to memory of 6064	4724	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\sanami.exe
"C:\Users\Admin\AppData\Local\Temp\sanami.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5808
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3996
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3400
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp460D.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4724
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5800
- - C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
    "C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:6064

C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
1⤵
- Executes dropped EXE
- Outbound SSH connection to public host
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:5696

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

Network Service Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

1

T1572

Exfiltration

Impact

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Downloads

tmp460D.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp460D.tmp.bat
Size 156B
SHA256 ead947e38f16a98b7fad50da0ed1373179ab6e9a09913650231c20c654f3bcef
MD5 8ff58d15bc708aee144c7872e751a198
SHA1 51fb5fe4f2daa55d83364fa11a91e41573f5b4b2
SHA512 9e1e4cba930e210ab201e5d5aecdb95d44fdee18dfa0aa4161d39a14d7e84ef2d6c6ded3a76c781bbfdde725171292707af5f7f4d8f55cb6e858231f69dbc6fa
TLSH
T108C02B5361C9EA2F2805B81717FED4CD91B26C993F44BB10C304405D62C0888F4ED382
MD5 SHA1 SHA512 TLSH

Submit Download

GoogleUpdate.exe

Path C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
Size 47KB
SHA256 eef6b84f963cbc03178aaa926c6daa1c10eef19db60a98e3395e15f42f87ecdf
MD5 5e6f4841183dbeb70751dcaba195ba35
SHA1 fee0683eca1499174b777a8f83b4b17162c37999
SHA512 44b619f2aed9384d5077320028ba2cbf8621c81c3c51c9e64458f60754e036ecc11a4bab3c29e7b3beb08dc17401b009a55af430244722ca8152c1e08cf1d755
SSDEEP 768:MuQqNTvEEaBrWUXFd5mo2qmiUh/knpHzxPIUUN//0bcAgSIGt2+ZjOMUbOMVX1WL:MuQqNT8572xFhMnpHSUUNkbPgqt2+NOI
TLSH
T1D4232B0037E98126F2BF4F74ADF33145867AB2676602D65E1CC441971B23FC69A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5808-0-0x0000000000F20000-0x0000000000F32000-memory.dmp

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memory/5808-1-0x0000000005A40000-0x0000000005A50000-memory.dmp

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memory/5808-2-0x00000000058E0000-0x0000000005946000-memory.dmp

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memory/5808-3-0x0000000005DF0000-0x0000000005E8C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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