asyncrat | 546b4c7d6b3692a56bf4a76be418f60363105a2611194ae3a1ae0e02eacede57

Analysis

max time kernel
143s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28/03/2024, 09:28

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General

Target
022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe
Size 100KB
Sample240328-lffvssfb46
SHA256 546b4c7d6b3692a56bf4a76be418f60363105a2611194ae3a1ae0e02eacede57
MD5 022dc0aa4834800b11017bf9ab574e5a
SHA1 dec98346de129ffb93975aaa6c8d941462f5ac40
SHA512 9f69e6b9f59e55d59049c93f87e9e335e9443ed4af2778b1640f9717420faf4acf03b66a4ec5f5e55e6729dc72a771dd4dedc8e52e518008e1fe6cfc27625e9c
SSDEEP 3072:nMSncRzAOMuy/TAGo2WHDy3bCjtN5npxAv:MSncRlMuyrRWG3bAJ
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

20.98.80.51:6606
20.98.80.51:7707
20.98.80.51:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
svchost.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/0x0008000000023268-4.dat	family_asyncrat

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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	ASYNCCLIENT.EXE

Executes dropped EXE 2 IoCs

pid	Process
3876	ASYNCCLIENT.EXE
5096	svchost.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
3328	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4748	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE
3876	ASYNCCLIENT.EXE

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3876	ASYNCCLIENT.EXE
Token: SeDebugPrivilege	5096	svchost.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 408 wrote to memory of 3876	408	022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe	95
PID 408 wrote to memory of 3876	408	022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe	95
PID 408 wrote to memory of 3876	408	022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe	95
PID 3876 wrote to memory of 2340	3876	ASYNCCLIENT.EXE	100
PID 3876 wrote to memory of 2340	3876	ASYNCCLIENT.EXE	100
PID 3876 wrote to memory of 2340	3876	ASYNCCLIENT.EXE	100
PID 3876 wrote to memory of 3304	3876	ASYNCCLIENT.EXE	102
PID 3876 wrote to memory of 3304	3876	ASYNCCLIENT.EXE	102
PID 3876 wrote to memory of 3304	3876	ASYNCCLIENT.EXE	102
PID 2340 wrote to memory of 3328	2340	cmd.exe	105
PID 2340 wrote to memory of 3328	2340	cmd.exe	105
PID 2340 wrote to memory of 3328	2340	cmd.exe	105
PID 3304 wrote to memory of 4748	3304	cmd.exe	106
PID 3304 wrote to memory of 4748	3304	cmd.exe	106
PID 3304 wrote to memory of 4748	3304	cmd.exe	106
PID 3304 wrote to memory of 5096	3304	cmd.exe	109
PID 3304 wrote to memory of 5096	3304	cmd.exe	109
PID 3304 wrote to memory of 5096	3304	cmd.exe	109

C:\Users\Admin\AppData\Local\Temp\022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\022dc0aa4834800b11017bf9ab574e5a_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:408
- C:\Users\Admin\AppData\Local\Temp\ASYNCCLIENT.EXE
  "C:\Users\Admin\AppData\Local\Temp\ASYNCCLIENT.EXE"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3876
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2340
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
      4⤵
      Creates scheduled task(s)
      PID:3328
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2323.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3304
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:4748
  - - C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:5096

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 --no-appcompat-clear --mojo-platform-channel-handle=3756 --field-trial-handle=2248,i,10247514684337323751,15511974759131734137,262144 --variations-seed-version /prefetch:8
1⤵
PID:3596

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

ASYNCCLIENT.EXE

Path C:\Users\Admin\AppData\Local\Temp\ASYNCCLIENT.EXE
Size 45KB
SHA256 c9e9b3fbdb6506df73347bcf5fcbed13db9b1c5e48b90203a60e1e672dc32a09
MD5 e9933bc58c6d7c0d0b76889255afa314
SHA1 67c27517573c280560950785ba2a54a677a0deb9
SHA512 c7475b3e67e9a7e3ed3e300127fafc6402361f9e024beb017165da4b238595b446c8c167084b3ae2a1d15864a45e50270501ac3be90752e2839b989a86a11aab
SSDEEP 768:3uyRNTAoZjRWUJs9bmo2qL7KjGKG6PIyzjbFgX3iEtCDiQqu4MVYo+BDZzx:3uyRNTAGo2WKYDy3bCXSEt+iQO3oQdzx
MD5 SHA1 SHA512 SSDEEP

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GOOGLE CHROME.LNK

Path C:\Users\Admin\AppData\Local\Temp\GOOGLE CHROME.LNK
Size 2KB
SHA256 0b22b12edbf9e345b3e42ddc9e972307bd7f407c949c7920f35b1bfcf51e34da
MD5 ee640251c3a742ce610f408eccaa507e
SHA1 6dcf6b81bab33d0d40018db1a4b931203aaafeb1
SHA512 2b2ad9d1862cb405e11e798b01be8878343e8fd445af3adb4775f5a1350c69307d8be6e5ae7b1dade11021f0af29d168005241ca88612a26bfaeba96ed6033bc
MD5 SHA1 SHA512

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tmp2323.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp2323.tmp.bat
Size 151B
SHA256 67727cfe5b9208a62af20b23f4815a652132310f7ffcfad1eeade5694c5b2cb1
MD5 74c4a873cd9893077c5cadcdf8b3af49
SHA1 13e35e5d24c0311d074af586d518417bb562c779
SHA512 40ffef998768c24da0d384eec2db4da957f783174b294ca39d9fc3a521dc5cf0aa2a42e76d361ad14115bf11994bd5a258f0965887d55228107d759091d6c5f8
MD5 SHA1 SHA512

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memory/3876-24-0x0000000073B40000-0x00000000742F0000-memory.dmp

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memory/3876-25-0x0000000000C50000-0x0000000000C62000-memory.dmp

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memory/3876-27-0x0000000005760000-0x0000000005770000-memory.dmp

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memory/3876-28-0x0000000005970000-0x0000000005A0C000-memory.dmp

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memory/3876-33-0x0000000073B40000-0x00000000742F0000-memory.dmp

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memory/5096-38-0x0000000074E30000-0x00000000755E0000-memory.dmp

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memory/5096-39-0x0000000074E30000-0x00000000755E0000-memory.dmp

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