quasar | d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c

General

Target

d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe
Size

1.5MB
MD5

f822f2ba51ac484e1e32cabfcf78e240
SHA1

5388a244ef7be66d3fc8e58e54c9f44dfc2e6396
SHA256

d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c
SHA512

671108fcb2b89bc06430df1cdd2ffc95ab9340bd01d394ba1c026b84689e54dadf1ac659852270a14a49d6a22fa6ac8f3192264f51c1c5dd36bc7df9375ee87c

Score

10^/10

quasar office01 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office01

C2

174.139.46.13:4782

Mutex

QSR_MUTEX_mK2M7xovgh7rCUSa7M

Attributes

encryption_key
0icGYPYyleDgljf1p7Zu
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Store
subdirectory
Windows

Signatures

Quasar Payload 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1584-138-0x0000000000B90000-0x0000000000C20000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Local\Temp\dll.exe	family_quasar
C:\Users\Admin\AppData\Local\Temp\dll.exe	family_quasar
C:\Users\Admin\AppData\Roaming\Windows\Client.exe	family_quasar
C:\Users\Admin\AppData\Roaming\Windows\Client.exe	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Executes dropped EXE 2 IoCs

Processes:

dll.exeClient.exe

pid process

1584 dll.exe
952 Client.exe

pid	process
1584	dll.exe
952	Client.exe

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:

d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe

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

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
T1053

Processes:

schtasks.exeschtasks.exe

pid process

2876 schtasks.exe
3944 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

dll.exeClient.exe

description pid process

Token: SeDebugPrivilege 1584 dll.exe
Token: SeDebugPrivilege 952 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

952 Client.exe

pid	process
2876	schtasks.exe
3944	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1584	dll.exe
Token: SeDebugPrivilege	952	Client.exe

pid	process
952	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exedll.exeClient.exe

description	pid	process	target process
PID 2308 wrote to memory of 1584	2308	d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe	dll.exe
PID 2308 wrote to memory of 1584	2308	d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe	dll.exe
PID 2308 wrote to memory of 1584	2308	d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe	dll.exe
PID 1584 wrote to memory of 2876	1584	dll.exe	schtasks.exe
PID 1584 wrote to memory of 2876	1584	dll.exe	schtasks.exe
PID 1584 wrote to memory of 2876	1584	dll.exe	schtasks.exe
PID 1584 wrote to memory of 952	1584	dll.exe	Client.exe
PID 1584 wrote to memory of 952	1584	dll.exe	Client.exe
PID 1584 wrote to memory of 952	1584	dll.exe	Client.exe
PID 952 wrote to memory of 3944	952	Client.exe	schtasks.exe
PID 952 wrote to memory of 3944	952	Client.exe	schtasks.exe
PID 952 wrote to memory of 3944	952	Client.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe
"C:\Users\Admin\AppData\Local\Temp\d9f5f1872cebecbcaa556c1d5371961731a7614fd141ba5040091a6e37b9346c.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2308

C:\Users\Admin\AppData\Local\Temp\dll.exe
"C:\Users\Admin\AppData\Local\Temp\dll.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1584

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Microsoft Store" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\dll.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2876

C:\Users\Admin\AppData\Roaming\Windows\Client.exe
"C:\Users\Admin\AppData\Roaming\Windows\Client.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:952

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Microsoft Store" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\Client.exe" /rl HIGHEST /f
4⤵
- Creates scheduled task(s)
PID:3944

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\dll.exe
Filesize
548KB

MD5
55a9c9861d5058eeffa6a7e8f80da7f4

SHA1
c18171180b61081a6087bf544c5150a26894896c

SHA256
7d53f16a9e5e88e017ed349d718b797fbc6c18cf4b17376bb00a2bb2d6066c6d

SHA512
e8ce69aa65dda216b73bf172ab77eb56aa6b49e2117f1531a82001122a316b3454c7dd19d61a01eb480aafea5262319441997d877a11c23d36b0da8d70b3459f

Download Submit
C:\Users\Admin\AppData\Local\Temp\dll.exe
Filesize
548KB

MD5
55a9c9861d5058eeffa6a7e8f80da7f4

SHA1
c18171180b61081a6087bf544c5150a26894896c

SHA256
7d53f16a9e5e88e017ed349d718b797fbc6c18cf4b17376bb00a2bb2d6066c6d

SHA512
e8ce69aa65dda216b73bf172ab77eb56aa6b49e2117f1531a82001122a316b3454c7dd19d61a01eb480aafea5262319441997d877a11c23d36b0da8d70b3459f

Download Submit
C:\Users\Admin\AppData\Roaming\Windows\Client.exe
Filesize
548KB

MD5
55a9c9861d5058eeffa6a7e8f80da7f4

SHA1
c18171180b61081a6087bf544c5150a26894896c

SHA256
7d53f16a9e5e88e017ed349d718b797fbc6c18cf4b17376bb00a2bb2d6066c6d

SHA512
e8ce69aa65dda216b73bf172ab77eb56aa6b49e2117f1531a82001122a316b3454c7dd19d61a01eb480aafea5262319441997d877a11c23d36b0da8d70b3459f

Download Submit
C:\Users\Admin\AppData\Roaming\Windows\Client.exe
Filesize
548KB

MD5
55a9c9861d5058eeffa6a7e8f80da7f4

SHA1
c18171180b61081a6087bf544c5150a26894896c

SHA256
7d53f16a9e5e88e017ed349d718b797fbc6c18cf4b17376bb00a2bb2d6066c6d

SHA512
e8ce69aa65dda216b73bf172ab77eb56aa6b49e2117f1531a82001122a316b3454c7dd19d61a01eb480aafea5262319441997d877a11c23d36b0da8d70b3459f

Download Submit
memory/952-145-0x0000000006330000-0x000000000636C000-memory.dmp

Filesize
240KB

Download
memory/952-142-0x0000000000000000-mapping.dmp

Download
memory/1584-140-0x00000000062B0000-0x00000000062C2000-memory.dmp

Filesize
72KB

Download
memory/1584-135-0x0000000000000000-mapping.dmp

Download
memory/1584-138-0x0000000000B90000-0x0000000000C20000-memory.dmp

Filesize
576KB

Download
memory/1584-139-0x0000000005660000-0x00000000056C6000-memory.dmp

Filesize
408KB

Download
memory/2308-133-0x00000000051D0000-0x00000000051DA000-memory.dmp

Filesize
40KB

Download
memory/2308-130-0x0000000000600000-0x0000000000790000-memory.dmp

Filesize
1.6MB

Download
memory/2308-131-0x00000000057B0000-0x0000000005D54000-memory.dmp

Filesize
5.6MB

Download
memory/2308-132-0x0000000005120000-0x00000000051B2000-memory.dmp

Filesize
584KB

Download
memory/2308-134-0x00000000075F0000-0x000000000768C000-memory.dmp

Filesize
624KB

Download
memory/2876-141-0x0000000000000000-mapping.dmp

Download
memory/3944-146-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads