quasar | abe621c37b2e40f6c6b3d9da15e37d4001188e10bac99e5d66c23cee23b98d03

General

Target

Build.exe
Size

15KB
MD5

27275853bd5996fb2f3767772d068d56
SHA1

14fb4c3c74870f14af8c4cd7c8eafa81c99c70c2
SHA256

abe621c37b2e40f6c6b3d9da15e37d4001188e10bac99e5d66c23cee23b98d03
SHA512

7e05ec050eaea236c04d74042ac1b2d5634e2be0dd3b8807bada25c38f2f758de9cc25d69fcfd5086b949dc74b97ad2401bce9e6db541153cec60e33024cc887
SSDEEP

384:twpcZrxSdohsUVdko8bxjsCa2txgb6P/sxErmM8/ANWUh:mpSk8VOfb2M669Sct

Score

10^/10

quasar office04 execution spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

31.177.108.29:4782

Mutex

553dcf2c-4c70-4c0c-935a-2e078a46f03e

Attributes

encryption_key
DAFF70D249B4EC619D5A052FDD3418E3549FF268
install_name
KR6nDu9fLhop1bFe.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Defender.Process
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3756-30-0x0000000000D60000-0x0000000001084000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exe

pid process

1992 powershell.exe
4272 powershell.exe
Downloads MZ/PE file
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:

Build.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation Build.exe
Executes dropped EXE 3 IoCs

Processes:

iZ5Mr99qorjPtTDp.exeKR6nDu9fLhop1bFe.exeolZa1OvV2BoFMUYp.exe

pid process

3756 iZ5Mr99qorjPtTDp.exe
1696 KR6nDu9fLhop1bFe.exe
3056 olZa1OvV2BoFMUYp.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
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

3 api.ipify.org
4 api.ipify.org
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 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

3864 schtasks.exe
3436 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

1992 powershell.exe
1992 powershell.exe
4272 powershell.exe
4272 powershell.exe

pid	process
1992	powershell.exe
4272	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	Build.exe

pid	process
3756	iZ5Mr99qorjPtTDp.exe
1696	KR6nDu9fLhop1bFe.exe
3056	olZa1OvV2BoFMUYp.exe

flow	ioc
3	api.ipify.org
4	api.ipify.org

pid	process
3864	schtasks.exe
3436	schtasks.exe

pid	process
1992	powershell.exe
1992	powershell.exe
4272	powershell.exe
4272	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

Build.exepowershell.exeiZ5Mr99qorjPtTDp.exeKR6nDu9fLhop1bFe.exepowershell.exe

description	pid	process
Token: SeDebugPrivilege	1476	Build.exe
Token: SeDebugPrivilege	1992	powershell.exe
Token: SeDebugPrivilege	3756	iZ5Mr99qorjPtTDp.exe
Token: SeDebugPrivilege	1696	KR6nDu9fLhop1bFe.exe
Token: SeDebugPrivilege	4272	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

1696 KR6nDu9fLhop1bFe.exe

pid	process
1696	KR6nDu9fLhop1bFe.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

Build.exeiZ5Mr99qorjPtTDp.exeKR6nDu9fLhop1bFe.exeolZa1OvV2BoFMUYp.exe

description	pid	process	target process
PID 1476 wrote to memory of 1992	1476	Build.exe	powershell.exe
PID 1476 wrote to memory of 1992	1476	Build.exe	powershell.exe
PID 1476 wrote to memory of 3756	1476	Build.exe	iZ5Mr99qorjPtTDp.exe
PID 1476 wrote to memory of 3756	1476	Build.exe	iZ5Mr99qorjPtTDp.exe
PID 3756 wrote to memory of 3864	3756	iZ5Mr99qorjPtTDp.exe	schtasks.exe
PID 3756 wrote to memory of 3864	3756	iZ5Mr99qorjPtTDp.exe	schtasks.exe
PID 3756 wrote to memory of 1696	3756	iZ5Mr99qorjPtTDp.exe	KR6nDu9fLhop1bFe.exe
PID 3756 wrote to memory of 1696	3756	iZ5Mr99qorjPtTDp.exe	KR6nDu9fLhop1bFe.exe
PID 1696 wrote to memory of 3436	1696	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 1696 wrote to memory of 3436	1696	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 1476 wrote to memory of 3056	1476	Build.exe	olZa1OvV2BoFMUYp.exe
PID 1476 wrote to memory of 3056	1476	Build.exe	olZa1OvV2BoFMUYp.exe
PID 3056 wrote to memory of 4272	3056	olZa1OvV2BoFMUYp.exe	powershell.exe
PID 3056 wrote to memory of 4272	3056	olZa1OvV2BoFMUYp.exe	powershell.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:\Users\Admin\AppData\Local\Temp\Build.exe
"C:\Users\Admin\AppData\Local\Temp\Build.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1476

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\SubDir'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1992

C:\Users\Admin\AppData\Roaming\SubDir\iZ5Mr99qorjPtTDp.exe
"C:\Users\Admin\AppData\Roaming\SubDir\iZ5Mr99qorjPtTDp.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3756

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3864

C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe
"C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1696

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
4⤵
- Creates scheduled task(s)
PID:3436

C:\Users\Admin\AppData\Roaming\SubDir\olZa1OvV2BoFMUYp.exe
"C:\Users\Admin\AppData\Roaming\SubDir\olZa1OvV2BoFMUYp.exe"
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3056

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"powershell.exe" -NoProfile -NonInteractive -NoLogo -Command "[Console]::OutputEncoding = [System.Text.Encoding]::UTF8; Get-Culture | Select -ExpandProperty DisplayName"
3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ibhmpc5a.iu2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\iJV9IBydfKeEjlXPz0X27H95jSaSUU\screen1.png

Filesize
470KB

MD5
f7976b5b2e52994dc7f0fd99eb4298c6

SHA1
4ab5ee6da8ea59eb931f088987a3ebb6342b2ade

SHA256
c470b5cea04aa2fd21ac20b69bd3a1a1b2e9b0c5dbd917d4284d0de5a969a0ab

SHA512
40653a035acf3b01c55cca8263fbf31e41c9bf21fc01f44c21dac6a035c2454e76d34fef93e8cbaf4ab44b62177dd4bcf7c60d45902c497eac677a8a546fcd28

Download Submit
C:\Users\Admin\AppData\Local\Temp\iJV9IBydfKeEjlXPz0X27H95jSaSUU\sensitive-files.zip

Filesize
2.4MB

MD5
9ba45267a4c8a07069e4624963c87dd8

SHA1
b69fd1f2e72ee319ea7ae9d5179f6df34b2e850b

SHA256
044596fcb58f238d4e88841dabf5b002f9af1dd741ba97279dcd38ab9c335649

SHA512
78640398e2d8372ee839bed344152675b29ba94ebccfb0aee91c936818effb90b76f1fa1f43db36b94eb82b0ea0eaeebf61982f857c1ec8bd44985524e128a8d

Download Submit
C:\Users\Admin\AppData\Local\Temp\iJV9IBydfKeEjlXPz0X27H95jSaSUU\user_info.txt

Filesize
732B

MD5
8b145d76613e14a27877b3ecf300c6f9

SHA1
d3cf27ea72c52e3efe55d41638a80be125d70fe7

SHA256
1a99d88d9cb2a18805a8bd30cdc1270913574e97dac6d18827a4e5e95240ba3e

SHA512
433dade4c80e7c6a52bc49ddc1d1f049ad4b9ba87b0b686a875cf722a427311ae8c24dab658debcd546aa4649ede65bd33dae151833caf561cb3a4c02c2990f8

Download Submit
memory/1476-40-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

Filesize
10.8MB

Download
memory/1476-0-0x000001F6B5390000-0x000001F6B539A000-memory.dmp

Filesize
40KB

Download
memory/1476-1-0x00007FFB43783000-0x00007FFB43785000-memory.dmp

Filesize
8KB

Download
memory/1476-2-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

Filesize
10.8MB

Download
memory/1476-50-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

Filesize
10.8MB

Download
memory/1476-39-0x00007FFB43783000-0x00007FFB43785000-memory.dmp

Filesize
8KB

Download
memory/1696-38-0x000000001BC60000-0x000000001BD12000-memory.dmp

Filesize
712KB

Download
memory/1696-37-0x0000000002C20000-0x0000000002C70000-memory.dmp

Filesize
320KB

Download
memory/1992-8-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

Filesize
10.8MB

Download
memory/1992-18-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

Filesize
10.8MB

Download
memory/1992-15-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

Filesize
10.8MB

Download
memory/1992-14-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

Filesize
10.8MB

Download
memory/1992-9-0x000001D35A0B0000-0x000001D35A0D2000-memory.dmp

Filesize
136KB

Download
memory/3756-30-0x0000000000D60000-0x0000000001084000-memory.dmp

Filesize
3.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads