quasar | 29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7

General

Target

29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe
Size

3.1MB
MD5

88fbaddac03a7dcf64d5c3d35de20dab
SHA1

52c48bb6e40d746de55a749dc5e6b5ee50da2b6b
SHA256

29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7
SHA512

86ac1ca0d3d96b17750e86b289b6e214d6d0f98c1a0b465caac767b3a08ace96fcb6baa5c0a984e0bbe5c33e5255971ac32dcca332e32df59085167bbf83ce79
SSDEEP

49152:avyI22SsaNYfdPBldt698dBcjHQAvGEEsMkCqMLoydb5THHB72eh2NT:avf22SsaNYfdPBldt6+dBcjHQAvzSx

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.77:4782

Mutex

57620c84-6018-493b-9afd-6585e4e16b44

Attributes

encryption_key
965D530FFAF12634A373AC54D155991C7805AEF2
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 payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2964-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2028-10-0x0000000000960000-0x0000000000C84000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2964-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/2028-10-0x0000000000960000-0x0000000000C84000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2964-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/memory/2028-10-0x0000000000960000-0x0000000000C84000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2964-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/memory/2028-10-0x0000000000960000-0x0000000000C84000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2028 Client.exe
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

2984 schtasks.exe
2696 schtasks.exe

pid	process
2028	Client.exe

pid	process
2984	schtasks.exe
2696	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2964	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe
Token: SeDebugPrivilege	2028	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2028 Client.exe

pid	process
2028	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exeClient.exe

description	pid	process	target process
PID 2964 wrote to memory of 2984	2964	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	schtasks.exe
PID 2964 wrote to memory of 2984	2964	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	schtasks.exe
PID 2964 wrote to memory of 2984	2964	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	schtasks.exe
PID 2964 wrote to memory of 2028	2964	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	Client.exe
PID 2964 wrote to memory of 2028	2964	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	Client.exe
PID 2964 wrote to memory of 2028	2964	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	Client.exe
PID 2028 wrote to memory of 2696	2028	Client.exe	schtasks.exe
PID 2028 wrote to memory of 2696	2028	Client.exe	schtasks.exe
PID 2028 wrote to memory of 2696	2028	Client.exe	schtasks.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\29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe
"C:\Users\Admin\AppData\Local\Temp\29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2964

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2984

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2028

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2696

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
88fbaddac03a7dcf64d5c3d35de20dab

SHA1
52c48bb6e40d746de55a749dc5e6b5ee50da2b6b

SHA256
29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7

SHA512
86ac1ca0d3d96b17750e86b289b6e214d6d0f98c1a0b465caac767b3a08ace96fcb6baa5c0a984e0bbe5c33e5255971ac32dcca332e32df59085167bbf83ce79

Download Submit
memory/2028-8-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2028-10-0x0000000000960000-0x0000000000C84000-memory.dmp

Filesize
3.1MB

Download
memory/2028-11-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2028-12-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2964-0-0x000007FEF5CE3000-0x000007FEF5CE4000-memory.dmp

Filesize
4KB

Download
memory/2964-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp

Filesize
3.1MB

Download
memory/2964-2-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2964-9-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads