quasar | e3ceb8681f33e2b9f491550e166dc72c1325581861927272895ba017941a7034

General

Target

Client-built.exe
Size

3.1MB
MD5

3010b26c30afcedafd065d7ed0f367fb
SHA1

8a0a354949de514c29839f597fec207384b8addb
SHA256

e3ceb8681f33e2b9f491550e166dc72c1325581861927272895ba017941a7034
SHA512

db95784c69baefc73d08715bd3efa4ebcffecab906c2a94c681bdef627f8d47a73a4d1616b3156fbb0484be758c73989bcd9efe94aa96a8c5b69ed2fb060300f
SSDEEP

49152:rvnI22SsaNYfdPBldt698dBcjHeCRJ6obR3LoGd4fHTHHB72eh2NT:rvI22SsaNYfdPBldt6+dBcjHeCRJ6CI

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

table-hon.gl.at.ply.gg:44654

Mutex

303304a0-34b4-436d-ad5b-84bd789784c4

Attributes

encryption_key
1E172C9B0BC2084D3120C199CF3C28EC683D69A1
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
System Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/1652-1-0x00000000011E0000-0x0000000001504000-memory.dmp	family_quasar
behavioral1/files/0x0008000000019227-6.dat	family_quasar
behavioral1/memory/3036-8-0x0000000000C90000-0x0000000000FB4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3036	Client.exe

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

System Information Discovery
T1082

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

pid	Process
1956	schtasks.exe
340	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1652	Client-built.exe
Token: SeDebugPrivilege	3036	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3036	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3036	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3036	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1652 wrote to memory of 1956	1652	Client-built.exe	30
PID 1652 wrote to memory of 1956	1652	Client-built.exe	30
PID 1652 wrote to memory of 1956	1652	Client-built.exe	30
PID 1652 wrote to memory of 3036	1652	Client-built.exe	32
PID 1652 wrote to memory of 3036	1652	Client-built.exe	32
PID 1652 wrote to memory of 3036	1652	Client-built.exe	32
PID 3036 wrote to memory of 340	3036	Client.exe	33
PID 3036 wrote to memory of 340	3036	Client.exe	33
PID 3036 wrote to memory of 340	3036	Client.exe	33

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1652
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "System Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1956
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3036
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "System Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:340

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

1

T1012

System Information Discovery

1

T1082

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
3010b26c30afcedafd065d7ed0f367fb

SHA1
8a0a354949de514c29839f597fec207384b8addb

SHA256
e3ceb8681f33e2b9f491550e166dc72c1325581861927272895ba017941a7034

SHA512
db95784c69baefc73d08715bd3efa4ebcffecab906c2a94c681bdef627f8d47a73a4d1616b3156fbb0484be758c73989bcd9efe94aa96a8c5b69ed2fb060300f

Download Submit
memory/1652-0-0x000007FEF6083000-0x000007FEF6084000-memory.dmp

Filesize
4KB

Download
memory/1652-1-0x00000000011E0000-0x0000000001504000-memory.dmp

Filesize
3.1MB

Download
memory/1652-2-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/1652-9-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/3036-8-0x0000000000C90000-0x0000000000FB4000-memory.dmp

Filesize
3.1MB

Download
memory/3036-10-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/3036-11-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/3036-12-0x000007FEF6080000-0x000007FEF6A6C000-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