asyncrat | be067c2c7c5a474442339d8adc999a0a288d56890d9781e88f536b6183cd398c

General

Target

service.exe
Size

237KB
MD5

ab439c03eb89bc15757588b7b030bea6
SHA1

50411b04ba6c51aab0f706e3a54fc548b5f8df0f
SHA256

be067c2c7c5a474442339d8adc999a0a288d56890d9781e88f536b6183cd398c
SHA512

7784fb618db8f2951bd8032154da86c9f139d51a4e541c9924cfccab99862efbcf92b8cbd582714e5f243d2cd5ee1b9fa2bb076f7d9b683e4b57e7b9e347c9a7
SSDEEP

3072:r4tWK9YMDbz6fV/NpbnyAGJwhOnQdT1MgvAOdj8MXoiTYfSHw69pJZXAqacHy1ly:m9j76xnImFZ1MmF8QTU/urSiLfTP8U

Score

10^/10

asyncrat default evasion rat

Malware Config

Extracted

Language

ps1

Source

URLs

exe.dropper

https://pastebin.com/raw/vNcCt60A

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

Mutex

Attributes

delay
3
install
false
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/3Z9zi18j

aes.plain

Signatures

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

Async RAT payload 3 IoCs

rat

resource	yara_rule
behavioral1/files/0x000800000002314e-184.dat	asyncrat
behavioral1/files/0x000800000002314e-186.dat	asyncrat
behavioral1/memory/3856-187-0x0000000000910000-0x0000000000922000-memory.dmp	asyncrat

Blocklisted process makes network request 2 IoCs

flow	pid	Process
55	428	powershell.exe
59	428	powershell.exe

Downloads MZ/PE file

Sets file to hidden 1 TTPs 1 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1158

pid	Process
1696	attrib.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-1013461898-3711306144-4198452673-1000\Control Panel\International\Geo\Nation	service.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1013461898-3711306144-4198452673-1000\Control Panel\International\Geo\Nation	WScript.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe	powershell.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
3856	tmp8DD7.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3380	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1013461898-3711306144-4198452673-1000_Classes\Local Settings	service.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
428	powershell.exe
428	powershell.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeDebugPrivilege	428	powershell.exe
Token: SeIncreaseQuotaPrivilege	428	powershell.exe
Token: SeSecurityPrivilege	428	powershell.exe
Token: SeTakeOwnershipPrivilege	428	powershell.exe
Token: SeLoadDriverPrivilege	428	powershell.exe
Token: SeSystemProfilePrivilege	428	powershell.exe
Token: SeSystemtimePrivilege	428	powershell.exe
Token: SeProfSingleProcessPrivilege	428	powershell.exe
Token: SeIncBasePriorityPrivilege	428	powershell.exe
Token: SeCreatePagefilePrivilege	428	powershell.exe
Token: SeBackupPrivilege	428	powershell.exe
Token: SeRestorePrivilege	428	powershell.exe
Token: SeShutdownPrivilege	428	powershell.exe
Token: SeDebugPrivilege	428	powershell.exe
Token: SeSystemEnvironmentPrivilege	428	powershell.exe
Token: SeRemoteShutdownPrivilege	428	powershell.exe
Token: SeUndockPrivilege	428	powershell.exe
Token: SeManageVolumePrivilege	428	powershell.exe
Token: 33	428	powershell.exe
Token: 34	428	powershell.exe
Token: 35	428	powershell.exe
Token: 36	428	powershell.exe
Token: SeDebugPrivilege	3856	tmp8DD7.exe
Token: SeDebugPrivilege	3856	tmp8DD7.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 668 wrote to memory of 724	668	service.exe	86
PID 668 wrote to memory of 724	668	service.exe	86
PID 668 wrote to memory of 724	668	service.exe	86
PID 724 wrote to memory of 428	724	WScript.exe	87
PID 724 wrote to memory of 428	724	WScript.exe	87
PID 724 wrote to memory of 428	724	WScript.exe	87
PID 428 wrote to memory of 1696	428	powershell.exe	103
PID 428 wrote to memory of 1696	428	powershell.exe	103
PID 428 wrote to memory of 1696	428	powershell.exe	103
PID 428 wrote to memory of 3856	428	powershell.exe	104
PID 428 wrote to memory of 3856	428	powershell.exe	104
PID 428 wrote to memory of 3856	428	powershell.exe	104
PID 3856 wrote to memory of 1192	3856	tmp8DD7.exe	106
PID 3856 wrote to memory of 1192	3856	tmp8DD7.exe	106
PID 3856 wrote to memory of 1192	3856	tmp8DD7.exe	106
PID 1192 wrote to memory of 3380	1192	cmd.exe	108
PID 1192 wrote to memory of 3380	1192	cmd.exe	108
PID 1192 wrote to memory of 3380	1192	cmd.exe	108

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
1696	attrib.exe

C:\Users\Admin\AppData\Local\Temp\service.exe
"C:\Users\Admin\AppData\Local\Temp\service.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:668
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\config.vbs"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:724
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Unrestricted -nologo -command .\service.ps1
    3⤵
    - Blocklisted process makes network request
    - Drops startup file
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:428
  - - C:\Windows\SysWOW64\attrib.exe
      "C:\Windows\System32\attrib.exe" +s +h .\\tmp8DD7.exe
      4⤵
      Sets file to hidden
      Drops startup file
      Views/modifies file attributes
      PID:1696
  - - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3856
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE9A9.tmp.bat""
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1192
      - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        6⤵
        Delays execution with timeout.exe
        
        PID:3380

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

2

T1158

Privilege Escalation

Defense Evasion

Hidden Files and Directories

Web Service

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\config.vbs

Filesize
147B

MD5
e04e55d2e6cc3d920631fdc5d6dcc1ce

SHA1
2c4dbcff71f8678623a7c197440ec281804dc5a5

SHA256
f641a99ec7e549970c81d724766f2a60ff031a5ec92aa6fc84228c82eeb4b4eb

SHA512
9511fe4dc599187f4539b8cda476550c54e86cbfcaca339a5db12e980ec322bf488d7458bf76089aa1d845f164f7ddb8adea017923d9a4930b9e821b7a4ae998

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\service.ps1

Filesize
949B

MD5
8a97b217587bf21df5b6be29428a1251

SHA1
33bc1ad54acc40f29d1b09767811c4a9f779f9a5

SHA256
ac975c8129b58f138e0f9880d5d63e6ca9e350c875e09a6dd5c16b40eaa9ea0d

SHA512
944c4fbbb3e92afad4cb4fc9f675cbe0b12ff3ef371fa1a5acdffb8489d7c7dde6e2cb8c2a1e194db9eba8e7c74db82b91ceaa40bc3f189924adaeae01cc2409

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_tsiv3qho.ovd.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpE9A9.tmp.bat

Filesize
202B

MD5
201e036830c697de9ac921e60ebd057c

SHA1
51a5797aaf13d7917b65eea111485ecd2c424117

SHA256
b5c79d2bc353cad9ec20c3d79e66d2aed3c15ed20939a9b66c768449d20b1338

SHA512
265f0284448e8fd7b84e8622af241aba782a6a578db614217a5081422208e8b45b5d88baa64b033ede20c7e4e146a7b2e099dbe6217bcd08ca6bddbea676c587

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe

Filesize
48KB

MD5
6b95c5b02a8c31726cab09fc575423d5

SHA1
840aedd363c32d13cf8ec14729f68b9e6c31d374

SHA256
ec22734717b5451dd8527cf3d564fe450d2a12523e5ec880b9d8c60345f762b9

SHA512
f6eeb9d5b44617103d96662311db7e483d5c1b7be849d8e99a9d9284dce830d7fcedaf4247d3e45e1823d27ed8ea6df328596744b6ee2de98ccfee0f36f5fb40

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe

Filesize
48KB

MD5
6b95c5b02a8c31726cab09fc575423d5

SHA1
840aedd363c32d13cf8ec14729f68b9e6c31d374

SHA256
ec22734717b5451dd8527cf3d564fe450d2a12523e5ec880b9d8c60345f762b9

SHA512
f6eeb9d5b44617103d96662311db7e483d5c1b7be849d8e99a9d9284dce830d7fcedaf4247d3e45e1823d27ed8ea6df328596744b6ee2de98ccfee0f36f5fb40

Download Submit
memory/428-156-0x0000000006330000-0x000000000634E000-memory.dmp

Filesize
120KB

Download
memory/428-177-0x000000007F670000-0x000000007F680000-memory.dmp

Filesize
64KB

Download
memory/428-151-0x0000000004D40000-0x0000000004D50000-memory.dmp

Filesize
64KB

Download
memory/428-144-0x0000000005D00000-0x0000000005D66000-memory.dmp

Filesize
408KB

Download
memory/428-143-0x0000000005C90000-0x0000000005CF6000-memory.dmp

Filesize
408KB

Download
memory/428-158-0x0000000004D40000-0x0000000004D50000-memory.dmp

Filesize
64KB

Download
memory/428-159-0x0000000007550000-0x00000000075E6000-memory.dmp

Filesize
600KB

Download
memory/428-160-0x0000000006870000-0x000000000688A000-memory.dmp

Filesize
104KB

Download
memory/428-161-0x00000000068C0000-0x00000000068E2000-memory.dmp

Filesize
136KB

Download
memory/428-162-0x0000000007BD0000-0x0000000008174000-memory.dmp

Filesize
5.6MB

Download
memory/428-163-0x0000000008800000-0x0000000008E7A000-memory.dmp

Filesize
6.5MB

Download
memory/428-164-0x0000000007670000-0x00000000076A2000-memory.dmp

Filesize
200KB

Download
memory/428-165-0x000000006F490000-0x000000006F4DC000-memory.dmp

Filesize
304KB

Download
memory/428-175-0x0000000008400000-0x000000000841E000-memory.dmp

Filesize
120KB

Download
memory/428-176-0x0000000008520000-0x000000000852A000-memory.dmp

Filesize
40KB

Download
memory/428-150-0x0000000004D40000-0x0000000004D50000-memory.dmp

Filesize
64KB

Download
memory/428-178-0x00000000086A0000-0x00000000086AE000-memory.dmp

Filesize
56KB

Download
memory/428-179-0x0000000008700000-0x000000000871A000-memory.dmp

Filesize
104KB

Download
memory/428-180-0x00000000086F0000-0x00000000086F8000-memory.dmp

Filesize
32KB

Download
memory/428-181-0x0000000004D40000-0x0000000004D50000-memory.dmp

Filesize
64KB

Download
memory/428-182-0x0000000004D40000-0x0000000004D50000-memory.dmp

Filesize
64KB

Download
memory/428-142-0x0000000005280000-0x00000000052A2000-memory.dmp

Filesize
136KB

Download
memory/428-185-0x0000000004D40000-0x0000000004D50000-memory.dmp

Filesize
64KB

Download
memory/428-141-0x0000000005400000-0x0000000005A28000-memory.dmp

Filesize
6.2MB

Download
memory/428-140-0x0000000004D90000-0x0000000004DC6000-memory.dmp

Filesize
216KB

Download
memory/3856-190-0x0000000005220000-0x0000000005230000-memory.dmp

Filesize
64KB

Download
memory/3856-191-0x0000000005B60000-0x0000000005BFC000-memory.dmp

Filesize
624KB

Download
memory/3856-192-0x0000000005220000-0x0000000005230000-memory.dmp

Filesize
64KB

Download
memory/3856-193-0x0000000007020000-0x0000000007096000-memory.dmp

Filesize
472KB

Download
memory/3856-194-0x0000000006FC0000-0x0000000006FDE000-memory.dmp

Filesize
120KB

Download
memory/3856-195-0x0000000007170000-0x0000000007202000-memory.dmp

Filesize
584KB

Download
memory/3856-187-0x0000000000910000-0x0000000000922000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads