quasar | 6c53c6883113580b6118856a433c5b2fb49a208e33d2faedb77d1e8609919af9

General

Target

39234b4b1387d417161e87d99f46f5d4.exe
Size

3.2MB
MD5

39234b4b1387d417161e87d99f46f5d4
SHA1

1b9239eea2e7cbf721cc4b71a7397ea49d3d0348
SHA256

6c53c6883113580b6118856a433c5b2fb49a208e33d2faedb77d1e8609919af9
SHA512

0afaf23be317dafb306365e21134a00aeb650b5bb1749d8e65f9361a67200c417c042233704f01628609ca3f2c2ed9295cdcb0b945a74b99ef9e1dee541a3817
SSDEEP

49152:lnvnI22SsaNYfdPBldt698dBcjHGcHZmzO8oGdG6THHB72eh2NT:lnvI22SsaNYfdPBldt6+dBcjHGcHQ

Score

10^/10

quasar ddns discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

DDNS

C2

193.161.193.99:32471

Mutex

807f3187-d087-4fff-beff-e73293a32af8

Attributes

encryption_key
81A0C14D4C705B3C678E573C849DE7F6A3671A8B
install_name
jusched.exe
log_directory
CachedLogs
reconnect_delay
3000
startup_key
Java Update Scheduler
subdirectory
Java

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/files/0x000c000000023b91-4.dat	family_quasar
behavioral2/memory/2084-14-0x0000000000840000-0x0000000000B64000-memory.dmp	family_quasar

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:

39234b4b1387d417161e87d99f46f5d4.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	39234b4b1387d417161e87d99f46f5d4.exe

Executes dropped EXE 2 IoCs

Processes:

JUSCHED.EXEjusched.exe

pid	Process
2084	JUSCHED.EXE
4296	jusched.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

39234b4b1387d417161e87d99f46f5d4.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	39234b4b1387d417161e87d99f46f5d4.exe

Modifies registry class 2 IoCs

Processes:

39234b4b1387d417161e87d99f46f5d4.exeOpenWith.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings	39234b4b1387d417161e87d99f46f5d4.exe
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings	OpenWith.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exe

pid	Process
2052	schtasks.exe
2952	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

JUSCHED.EXEjusched.exe

description	pid	Process
Token: SeDebugPrivilege	2084	JUSCHED.EXE
Token: SeDebugPrivilege	4296	jusched.exe

Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

jusched.exe

pid	Process
4296	jusched.exe
4296	jusched.exe

Suspicious use of SendNotifyMessage 2 IoCs

Processes:

jusched.exe

pid	Process
4296	jusched.exe
4296	jusched.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

OpenWith.exejusched.exe

pid	Process
544	OpenWith.exe
4296	jusched.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

39234b4b1387d417161e87d99f46f5d4.exeJUSCHED.EXEjusched.exe

description	pid	Process	procid_target
PID 2296 wrote to memory of 2084	2296	39234b4b1387d417161e87d99f46f5d4.exe	83
PID 2296 wrote to memory of 2084	2296	39234b4b1387d417161e87d99f46f5d4.exe	83
PID 2084 wrote to memory of 2052	2084	JUSCHED.EXE	85
PID 2084 wrote to memory of 2052	2084	JUSCHED.EXE	85
PID 2084 wrote to memory of 4296	2084	JUSCHED.EXE	87
PID 2084 wrote to memory of 4296	2084	JUSCHED.EXE	87
PID 4296 wrote to memory of 2952	4296	jusched.exe	88
PID 4296 wrote to memory of 2952	4296	jusched.exe	88

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\39234b4b1387d417161e87d99f46f5d4.exe
"C:\Users\Admin\AppData\Local\Temp\39234b4b1387d417161e87d99f46f5d4.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2296
- C:\Users\Admin\AppData\Local\Temp\JUSCHED.EXE
  "C:\Users\Admin\AppData\Local\Temp\JUSCHED.EXE"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2084
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Java Update Scheduler" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Java\jusched.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2052
- - C:\Users\Admin\AppData\Roaming\Java\jusched.exe
    "C:\Users\Admin\AppData\Roaming\Java\jusched.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4296
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Java Update Scheduler" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Java\jusched.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2952

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:544

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Users\Admin\AppData\Local\Temp\JUSCHED.EXE

Filesize
3.1MB

MD5
de7dbb5ed397ff41da4b1de1af4fbac5

SHA1
fcf8b29628d4cae9109b642c3a65a20178cca98a

SHA256
acfffb20520bcc954ecf5cc107521efa96c76b0a43e61a83628f580dae87c996

SHA512
182afaabf28848d5ea2f2a55dc6e7ac5d1903f97e0f0640710e1ff8470c31f01ba68c0d8c548f16261a13a29488c34c91b61a2f8b958736eae126b766a42c5d8

Download Submit
memory/2084-13-0x00007FFD0AF03000-0x00007FFD0AF05000-memory.dmp

Filesize
8KB

Download
memory/2084-14-0x0000000000840000-0x0000000000B64000-memory.dmp

Filesize
3.1MB

Download
memory/2084-15-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download
memory/2084-23-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download
memory/4296-24-0x000000001BD30000-0x000000001BD80000-memory.dmp

Filesize
320KB

Download
memory/4296-25-0x000000001C490000-0x000000001C542000-memory.dmp

Filesize
712KB

Download
memory/4296-28-0x000000001C3F0000-0x000000001C402000-memory.dmp

Filesize
72KB

Download
memory/4296-29-0x000000001C450000-0x000000001C48C000-memory.dmp

Filesize
240KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads