quasar | e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

General

Target

e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe
Size

3.1MB
MD5

e9a138d8c5ab2cccc8bf9976f66d30c8
SHA1

e996894168f0d4e852162d1290250dfa986310f8
SHA256

e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3
SHA512

5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc
SSDEEP

49152:fvrI22SsaNYfdPBldt698dBcjHCWvXE/sGkCqILo+dPVTHHB72eh2NT:fvU22SsaNYfdPBldt6+dBcjHCWvTm

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Dystopian-62863.portmap.host:62863

Mutex

e1de8f9b-5a7a-4798-a6fb-c03591ef3442

Attributes

encryption_key
8C1BB32BFD240218BA0CB04D65341FB1FDE1E001
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SubStart
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/3028-1-0x00000000011D0000-0x00000000014F4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015686-6.dat	family_quasar
behavioral1/memory/2664-9-0x0000000001080000-0x00000000013A4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2664	Client.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

pid	Process
2760	schtasks.exe
3060	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3028	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe
Token: SeDebugPrivilege	2664	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2664	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3028 wrote to memory of 3060	3028	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	30
PID 3028 wrote to memory of 3060	3028	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	30
PID 3028 wrote to memory of 3060	3028	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	30
PID 3028 wrote to memory of 2664	3028	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	32
PID 3028 wrote to memory of 2664	3028	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	32
PID 3028 wrote to memory of 2664	3028	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	32
PID 2664 wrote to memory of 2760	2664	Client.exe	33
PID 2664 wrote to memory of 2760	2664	Client.exe	33
PID 2664 wrote to memory of 2760	2664	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\e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe
"C:\Users\Admin\AppData\Local\Temp\e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3028
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3060
- 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:2664
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2760

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

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
e9a138d8c5ab2cccc8bf9976f66d30c8

SHA1
e996894168f0d4e852162d1290250dfa986310f8

SHA256
e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

SHA512
5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc

Download Submit
memory/2664-10-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/2664-9-0x0000000001080000-0x00000000013A4000-memory.dmp

Filesize
3.1MB

Download
memory/2664-11-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/2664-12-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/2664-13-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/3028-0-0x000007FEF5BB3000-0x000007FEF5BB4000-memory.dmp

Filesize
4KB

Download
memory/3028-1-0x00000000011D0000-0x00000000014F4000-memory.dmp

Filesize
3.1MB

Download
memory/3028-2-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/3028-8-0x000007FEF5BB0000-0x000007FEF659C000-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