asyncrat | 28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445

Analysis

max time kernel
149s
max time network
129s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
21/08/2026, 10:36

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General

Target
28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
Size 45KB
Sample260821-mnkdmacp3s
SHA256 28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445
MD5 68625fa60ad6398477e5f21aaf9e2c89
SHA1 bbb767bd64b4faf64fa6378374024f78e270a180
SHA512 e6a1c42be0cc63f085c1ec4420fb706040224db94290812fc31468dc953ca138c2bc31ae36363bda3c3841aa935980138609bfd654e31b117ce87db8a09d0d1d
SSDEEP 768:IuuZ5TbUo/BWUlf+DHmo2q7iELL0Yj/OPICtzjb7gX3i/+AUwY+/oz9uqIRUBDZD:IuuZ5Tbjst2sbT3Ct3bEXS/VxbozY/iJ
TLSH
T1B6231A003BE9812BF2BE4F78A9F26146467AF6637603D5492CC442D75713FC68A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

e.streamforester.name:80
e.streamforester.name:22
e.streamforester.name:8080
e.streamforester.name:8880
e.streamforester.name:2052
e.streamforester.name:2082
e.streamforester.name:2086
e.streamforester.name:2095
e.streamforester.name:443
e.streamforester.name:2053
e.streamforester.name:2083
e.streamforester.name:2087
e.streamforester.name:2096
e.streamforester.name:8443
www.e.streamforester.name:80
www.e.streamforester.name:22
www.e.streamforester.name:8080
www.e.streamforester.name:8880
www.e.streamforester.name:2052
www.e.streamforester.name:2082
www.e.streamforester.name:2086
www.e.streamforester.name:2095
www.e.streamforester.name:443
www.e.streamforester.name:2053
www.e.streamforester.name:2083
www.e.streamforester.name:2087
www.e.streamforester.name:2096
www.e.streamforester.name:8443
zbot.e.streamforester.name:80
zbot.e.streamforester.name:22
zbot.e.streamforester.name:8080
zbot.e.streamforester.name:8880
zbot.e.streamforester.name:2052
zbot.e.streamforester.name:2082
zbot.e.streamforester.name:2086
zbot.e.streamforester.name:2095
zbot.e.streamforester.name:443
zbot.e.streamforester.name:2053
zbot.e.streamforester.name:2083
zbot.e.streamforester.name:2087
zbot.e.streamforester.name:2096
zbot.e.streamforester.name:8443
trickbot.e.streamforester.name:80
trickbot.e.streamforester.name:22
trickbot.e.streamforester.name:8080
trickbot.e.streamforester.name:8880
trickbot.e.streamforester.name:2052
trickbot.e.streamforester.name:2082
trickbot.e.streamforester.name:2086
trickbot.e.streamforester.name:2095
trickbot.e.streamforester.name:443
trickbot.e.streamforester.name:2053
trickbot.e.streamforester.name:2083
trickbot.e.streamforester.name:2087
trickbot.e.streamforester.name:2096
trickbot.e.streamforester.name:8443
gh0st.e.streamforester.name:80
gh0st.e.streamforester.name:22
gh0st.e.streamforester.name:8080
gh0st.e.streamforester.name:8880
gh0st.e.streamforester.name:2052
gh0st.e.streamforester.name:2082
gh0st.e.streamforester.name:2086
gh0st.e.streamforester.name:2095
gh0st.e.streamforester.name:443
gh0st.e.streamforester.name:2053
gh0st.e.streamforester.name:2083
gh0st.e.streamforester.name:2087
gh0st.e.streamforester.name:2096
gh0st.e.streamforester.name:8443
invasive.e.streamforester.name:80
invasive.e.streamforester.name:22
invasive.e.streamforester.name:8080
invasive.e.streamforester.name:8880
invasive.e.streamforester.name:2052
invasive.e.streamforester.name:2082
invasive.e.streamforester.name:2086
invasive.e.streamforester.name:2095
invasive.e.streamforester.name:443
invasive.e.streamforester.name:2053
invasive.e.streamforester.name:2083
invasive.e.streamforester.name:2087
invasive.e.streamforester.name:2096
invasive.e.streamforester.name:8443

Mutex

wNefTbHAmze3

Attributes

delay
0
install
true
install_file
efuomy.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 2 IoCs

rat

resource	yara_rule
behavioral1/files/0x000a0000000244e6-8.dat	family_asyncrat
behavioral1/memory/2464-10-0x0000000004C40000-0x0000000004C50000-memory.dmp	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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe

Executes dropped EXE 2 IoCs

pid	Process
2464	efuomy.exe
1116	efuomy.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
4332	cmd.exe
4340	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	efuomy.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	efuomy.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1592	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
3848	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
Token: SeDebugPrivilege	2464	efuomy.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1348 wrote to memory of 4340	1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe	85
PID 1348 wrote to memory of 4332	1348	28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe	87
PID 4332 wrote to memory of 1592	4332	cmd.exe	89
PID 4340 wrote to memory of 3848	4340	cmd.exe	90
PID 4332 wrote to memory of 1116	4332	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe
"C:\Users\Admin\AppData\Local\Temp\28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1348
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "efuomy" /tr '"C:\Users\Admin\AppData\Roaming\efuomy.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4340
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "efuomy" /tr '"C:\Users\Admin\AppData\Roaming\efuomy.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3848
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB7D2.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4332
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1592
- - C:\Users\Admin\AppData\Roaming\efuomy.exe
    "C:\Users\Admin\AppData\Roaming\efuomy.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1116

C:\Users\Admin\AppData\Roaming\efuomy.exe
"C:\Users\Admin\AppData\Roaming\efuomy.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2464

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmpB7D2.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpB7D2.tmp.bat
Size 150B
SHA256 80984765f563ae75ffdfb58f011eafdb4077298137b9c8a91bc42eb9617991db
MD5 3a3bd9a474e31ddde45d03bab9b57991
SHA1 61779dccf55628c3618957e79e78b286498927cb
SHA512 c34edea18b89a3344627fdafef6907d3053919a60a56fab5ddbef02c7fafbe276f714fd3f6d592d43a61c116f07ad2082d1b568688270f29c5a2bc8880a84ec9
TLSH
T1F8C02B83A1C7EA4F3806146316FEE58DA1766C693FC0FB00C304400E12808DCF4E9381
MD5 SHA1 SHA512 TLSH

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efuomy.exe

Path C:\Users\Admin\AppData\Roaming\efuomy.exe
Size 45KB
SHA256 28803c20b8b5228713acc1e7b6d8002969c1ae25a3161618fdefed205f424445
MD5 68625fa60ad6398477e5f21aaf9e2c89
SHA1 bbb767bd64b4faf64fa6378374024f78e270a180
SHA512 e6a1c42be0cc63f085c1ec4420fb706040224db94290812fc31468dc953ca138c2bc31ae36363bda3c3841aa935980138609bfd654e31b117ce87db8a09d0d1d
SSDEEP 768:IuuZ5TbUo/BWUlf+DHmo2q7iELL0Yj/OPICtzjb7gX3i/+AUwY+/oz9uqIRUBDZD:IuuZ5Tbjst2sbT3Ct3bEXS/VxbozY/iJ
TLSH
T1B6231A003BE9812BF2BE4F78A9F26146467AF6637603D5492CC442D75713FC68A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1348-0-0x00000000001B0000-0x00000000001C2000-memory.dmp

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memory/1348-1-0x0000000004B50000-0x0000000004B60000-memory.dmp

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memory/1348-2-0x0000000004C00000-0x0000000004C9C000-memory.dmp

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memory/2464-10-0x0000000004C40000-0x0000000004C50000-memory.dmp

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memory/2464-13-0x0000000004C40000-0x0000000004C50000-memory.dmp

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