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 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2864-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2864-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2864-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2864-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

4860 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

4032 schtasks.exe
716 schtasks.exe

pid	process
4860	Client.exe

pid	process
4032	schtasks.exe
716	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2864	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe
Token: SeDebugPrivilege	4860	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

4860 Client.exe

pid	process
4860	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exeClient.exe

description	pid	process	target process
PID 2864 wrote to memory of 4032	2864	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	schtasks.exe
PID 2864 wrote to memory of 4032	2864	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	schtasks.exe
PID 2864 wrote to memory of 4860	2864	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	Client.exe
PID 2864 wrote to memory of 4860	2864	29fb5f7b7dfb67eef0c61a9399135775faa115fbf3671cf8a58cc50c049657e7.exe	Client.exe
PID 4860 wrote to memory of 716	4860	Client.exe	schtasks.exe
PID 4860 wrote to memory of 716	4860	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:2864

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:4032

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:4860

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:716

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4268,i,18168883380598738769,14202261231630113808,262144 --variations-seed-version --mojo-platform-channel-handle=4300 /prefetch:8
1⤵
PID:3868

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/2864-0-0x00007FFCC2C33000-0x00007FFCC2C35000-memory.dmp

Filesize
8KB

Download
memory/2864-1-0x0000000000E90000-0x00000000011B4000-memory.dmp

Filesize
3.1MB

Download
memory/2864-2-0x00007FFCC2C30000-0x00007FFCC36F1000-memory.dmp

Filesize
10.8MB

Download
memory/2864-9-0x00007FFCC2C30000-0x00007FFCC36F1000-memory.dmp

Filesize
10.8MB

Download
memory/4860-10-0x00007FFCC2C30000-0x00007FFCC36F1000-memory.dmp

Filesize
10.8MB

Download
memory/4860-11-0x00007FFCC2C30000-0x00007FFCC36F1000-memory.dmp

Filesize
10.8MB

Download
memory/4860-12-0x000000001B230000-0x000000001B280000-memory.dmp

Filesize
320KB

Download
memory/4860-13-0x000000001BA40000-0x000000001BAF2000-memory.dmp

Filesize
712KB

Download
memory/4860-14-0x00007FFCC2C30000-0x00007FFCC36F1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads