quasar | 6333b624e660914372affcb1c1018727a6af72e3f4cbf572e40f7f91596db233

General

Target

Poisontree.exe
Size

11KB
MD5

704a84956ccaafdf044a5aed5e02d7f6
SHA1

31e4f4591084991d0e1b56a8edb04c9c12c47f8d
SHA256

6333b624e660914372affcb1c1018727a6af72e3f4cbf572e40f7f91596db233
SHA512

c913e2358405d9fd089de4fcfca0b0784c5c5768c6dd790354bde0f2dabf191bdf8e0d98df7ac94ceb3075c2e94595b1bcb5479e45601df5b83129ca05c1bbdf
SSDEEP

192:yj6Zyx2ZDJ5xwdGO2zpKetQZz5ZLbrYWL39mxWpQVLSLrLF+3g8NaVe+fuSEZT:C6Zyx2ZDJ5xwdGO2zpKet+dZLtLNmxWk

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.227:4782

Mutex

f3d13830-043f-4b71-9ea6-e9606fbe9c47

Attributes

encryption_key
E5250226804167CB0B1B4B0E9667D0C056694DCA
install_name
defenderx64.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender Helper
subdirectory
Windows Defender

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\defender64.exe	family_quasar
behavioral2/memory/2280-19-0x0000000000850000-0x0000000000B74000-memory.dmp	family_quasar

Downloads MZ/PE file

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:

Poisontree.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1162180587-977231257-2194346871-1000\Control Panel\International\Geo\Nation	Poisontree.exe

Executes dropped EXE 2 IoCs

Processes:

defender64.exedefenderx64.exe

pid process

2280 defender64.exe
3056 defenderx64.exe
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service
T1102

Processes:

flow ioc

16 raw.githubusercontent.com
17 raw.githubusercontent.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
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

3700 schtasks.exe
2304 schtasks.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Poisontree.exedefender64.exedefenderx64.exe

description pid process

Token: SeDebugPrivilege 532 Poisontree.exe
Token: SeDebugPrivilege 2280 defender64.exe
Token: SeDebugPrivilege 3056 defenderx64.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

defenderx64.exe

pid process

3056 defenderx64.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

defenderx64.exe

pid process

3056 defenderx64.exe

pid	process
2280	defender64.exe
3056	defenderx64.exe

flow	ioc
16	raw.githubusercontent.com
17	raw.githubusercontent.com

pid	process
3700	schtasks.exe
2304	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	532	Poisontree.exe
Token: SeDebugPrivilege	2280	defender64.exe
Token: SeDebugPrivilege	3056	defenderx64.exe

pid	process
3056	defenderx64.exe

pid	process
3056	defenderx64.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Poisontree.exedefender64.exedefenderx64.exe

description	pid	process	target process
PID 532 wrote to memory of 2280	532	Poisontree.exe	defender64.exe
PID 532 wrote to memory of 2280	532	Poisontree.exe	defender64.exe
PID 2280 wrote to memory of 3700	2280	defender64.exe	schtasks.exe
PID 2280 wrote to memory of 3700	2280	defender64.exe	schtasks.exe
PID 2280 wrote to memory of 3056	2280	defender64.exe	defenderx64.exe
PID 2280 wrote to memory of 3056	2280	defender64.exe	defenderx64.exe
PID 3056 wrote to memory of 2304	3056	defenderx64.exe	schtasks.exe
PID 3056 wrote to memory of 2304	3056	defenderx64.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\Poisontree.exe
"C:\Users\Admin\AppData\Local\Temp\Poisontree.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:532

C:\Users\Admin\AppData\Local\Temp\defender64.exe
"C:\Users\Admin\AppData\Local\Temp\defender64.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2280

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Defender\defenderx64.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3700

C:\Users\Admin\AppData\Roaming\Windows Defender\defenderx64.exe
"C:\Users\Admin\AppData\Roaming\Windows Defender\defenderx64.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:3056

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Defender\defenderx64.exe" /rl HIGHEST /f
4⤵
- Creates scheduled task(s)
PID:2304

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\defender64.exe

Filesize
3.1MB

MD5
266ea912a1c1d768a3e2268ee212e79b

SHA1
741ab991660b5568ea0108e6b0e0784c67f1fc17

SHA256
dbb17bdad394245516b31e3e286453bc7e3de9d6788627fd8970dd588f81f063

SHA512
755ad73b05ea6a33e6bfbc0da8482030c2a12e86b751dd9bfe80c7afee097074061a9bb7a73b04a646d1fb3a41e2255abb78d2fbed9a79a3fec9cc30eeae7ae2

Download Submit
memory/532-30-0x0000000074D0E000-0x0000000074D0F000-memory.dmp

Filesize
4KB

Download
memory/532-1-0x0000000000E60000-0x0000000000E6A000-memory.dmp

Filesize
40KB

Download
memory/532-2-0x0000000005DF0000-0x0000000006394000-memory.dmp

Filesize
5.6MB

Download
memory/532-3-0x00000000058E0000-0x0000000005972000-memory.dmp

Filesize
584KB

Download
memory/532-4-0x0000000005870000-0x000000000587A000-memory.dmp

Filesize
40KB

Download
memory/532-5-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/532-32-0x0000000005A50000-0x0000000005A60000-memory.dmp

Filesize
64KB

Download
memory/532-0-0x0000000074D0E000-0x0000000074D0F000-memory.dmp

Filesize
4KB

Download
memory/532-21-0x0000000005A50000-0x0000000005A60000-memory.dmp

Filesize
64KB

Download
memory/532-31-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/2280-19-0x0000000000850000-0x0000000000B74000-memory.dmp

Filesize
3.1MB

Download
memory/2280-27-0x00007FFCD8980000-0x00007FFCD9441000-memory.dmp

Filesize
10.8MB

Download
memory/2280-20-0x00007FFCD8980000-0x00007FFCD9441000-memory.dmp

Filesize
10.8MB

Download
memory/2280-18-0x00007FFCD8983000-0x00007FFCD8985000-memory.dmp

Filesize
8KB

Download
memory/3056-28-0x000000001BE00000-0x000000001BE50000-memory.dmp

Filesize
320KB

Download
memory/3056-29-0x000000001BF10000-0x000000001BFC2000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads