quasar | c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884

General

Target

Client-built.exe
Size

3.1MB
MD5

528aac487e4cb55751f89428aa946f35
SHA1

1d4a43e2df64526a88ba7a1e3abc4059d02bb6d2
SHA256

c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884
SHA512

c7d39ecf98a4dd2ba0cd7341ece289934e5e658e1006c4d7cb3713da4ca0bae6feb5a4e544c34c265673b5ea211c877f5b23b2dad15e89cf8502b695ba2742b9
SSDEEP

49152:mv2I22SsaNYfdPBldt698dBcjHyxRcmCZLoed3UfyTHHB72eh2NT:mvb22SsaNYfdPBldt6+dBcjHyxRGR

Score

10^/10

quasar office01 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

sabaf-38910.portmap.host:38910

Mutex

f7356d60-951e-494a-a901-2e12bb084129

Attributes

encryption_key
5C7AC20AEB149D8BC06141FCF79866AD6E3847AD
install_name
RuntimeBroker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RunTimeBroker
subdirectory
System32

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/816-1-0x0000000000500000-0x0000000000824000-memory.dmp	family_quasar
behavioral2/files/0x000d000000023d0f-8.dat	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
24	3116	Process not Found

Executes dropped EXE 1 IoCs

pid	Process
4284	RuntimeBroker.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\System32	RuntimeBroker.exe
File created	C:\Windows\system32\System32\RuntimeBroker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\System32\RuntimeBroker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\System32	Client-built.exe
File opened for modification	C:\Windows\system32\System32\RuntimeBroker.exe	RuntimeBroker.exe

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

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

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
468	MicrosoftEdgeUpdate.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	816	Client-built.exe
Token: SeDebugPrivilege	4284	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4284	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 816 wrote to memory of 4284	816	Client-built.exe	89
PID 816 wrote to memory of 4284	816	Client-built.exe	89

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:816
- C:\Windows\system32\System32\RuntimeBroker.exe
  "C:\Windows\system32\System32\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:4284

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIyIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU4MTUiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODE1MzQzMTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI0ODM3MzY0ODUxIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:468

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\system32\System32\RuntimeBroker.exe

Filesize
3.1MB

MD5
528aac487e4cb55751f89428aa946f35

SHA1
1d4a43e2df64526a88ba7a1e3abc4059d02bb6d2

SHA256
c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884

SHA512
c7d39ecf98a4dd2ba0cd7341ece289934e5e658e1006c4d7cb3713da4ca0bae6feb5a4e544c34c265673b5ea211c877f5b23b2dad15e89cf8502b695ba2742b9

Download Submit
memory/816-0-0x00007FFA80673000-0x00007FFA80675000-memory.dmp

Filesize
8KB

Download
memory/816-1-0x0000000000500000-0x0000000000824000-memory.dmp

Filesize
3.1MB

Download
memory/816-2-0x00007FFA80670000-0x00007FFA81131000-memory.dmp

Filesize
10.8MB

Download
memory/816-9-0x00007FFA80670000-0x00007FFA81131000-memory.dmp

Filesize
10.8MB

Download
memory/4284-10-0x00007FFA80670000-0x00007FFA81131000-memory.dmp

Filesize
10.8MB

Download
memory/4284-11-0x000000001C900000-0x000000001C950000-memory.dmp

Filesize
320KB

Download
memory/4284-12-0x000000001CA10000-0x000000001CAC2000-memory.dmp

Filesize
712KB

Download
memory/4284-13-0x00007FFA80670000-0x00007FFA81131000-memory.dmp

Filesize
10.8MB

Download

Analysis

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