quasar | 164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f

Analysis

max time kernel
146s
max time network
147s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
19-06-2024 01:07

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General

Target

164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe
Size

3.1MB
MD5

1b27e622f4edbbdd8fc93a0d1c129607
SHA1

3e7b42dd10c01f632f158cc96701f6ba49ebec48
SHA256

164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f
SHA512

bd6d609019f06649db920244a91ef5a2f105ea81055cdd53df72e737e1aae75b340060f45cb56383d201c154591a0a297fd69e1d09c5239b96ea5765a823ef5c
SSDEEP

49152:kvHI22SsaNYfdPBldt698dBcjHn30LdBhJo2d/UTHHB72eh2NT:kvo22SsaNYfdPBldt6+dBcjH30nv

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

94.228.166.40:4782

Mutex

172a89d7-b9b2-4d82-b5ed-6beb5326f544

Attributes

encryption_key
7970C2029EDBB83E6BD65073BE18684AC9FF3F48
install_name
KR6nDu9fLhop1bFe.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Defender.proces
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2420-1-0x0000000001070000-0x0000000001394000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe	family_quasar
behavioral1/memory/1908-10-0x00000000003F0000-0x0000000000714000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2420-1-0x0000000001070000-0x0000000001394000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/1908-10-0x00000000003F0000-0x0000000000714000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2420-1-0x0000000001070000-0x0000000001394000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/memory/1908-10-0x00000000003F0000-0x0000000000714000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2420-1-0x0000000001070000-0x0000000001394000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/memory/1908-10-0x00000000003F0000-0x0000000000714000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

1908 KR6nDu9fLhop1bFe.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

Processes:

schtasks.exeschtasks.exe

pid process

2948 schtasks.exe
2172 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exeKR6nDu9fLhop1bFe.exe

description pid process

Token: SeDebugPrivilege 2420 164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe
Token: SeDebugPrivilege 1908 KR6nDu9fLhop1bFe.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

1908 KR6nDu9fLhop1bFe.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

1908 KR6nDu9fLhop1bFe.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

1908 KR6nDu9fLhop1bFe.exe

pid	process
1908	KR6nDu9fLhop1bFe.exe

pid	process
2948	schtasks.exe
2172	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2420	164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe
Token: SeDebugPrivilege	1908	KR6nDu9fLhop1bFe.exe

pid	process
1908	KR6nDu9fLhop1bFe.exe

pid	process
1908	KR6nDu9fLhop1bFe.exe

pid	process
1908	KR6nDu9fLhop1bFe.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exeKR6nDu9fLhop1bFe.exe

description	pid	process	target process
PID 2420 wrote to memory of 2948	2420	164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe	schtasks.exe
PID 2420 wrote to memory of 2948	2420	164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe	schtasks.exe
PID 2420 wrote to memory of 2948	2420	164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe	schtasks.exe
PID 2420 wrote to memory of 1908	2420	164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe	KR6nDu9fLhop1bFe.exe
PID 2420 wrote to memory of 1908	2420	164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe	KR6nDu9fLhop1bFe.exe
PID 2420 wrote to memory of 1908	2420	164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe	KR6nDu9fLhop1bFe.exe
PID 1908 wrote to memory of 2172	1908	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 1908 wrote to memory of 2172	1908	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 1908 wrote to memory of 2172	1908	KR6nDu9fLhop1bFe.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\164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe
"C:\Users\Admin\AppData\Local\Temp\164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2420

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Defender.proces" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:2948

C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe
"C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.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:1908

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Defender.proces" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2172

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe
Filesize
3.1MB

MD5
1b27e622f4edbbdd8fc93a0d1c129607

SHA1
3e7b42dd10c01f632f158cc96701f6ba49ebec48

SHA256
164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f

SHA512
bd6d609019f06649db920244a91ef5a2f105ea81055cdd53df72e737e1aae75b340060f45cb56383d201c154591a0a297fd69e1d09c5239b96ea5765a823ef5c

Download Submit
memory/1908-8-0x000007FEF52E0000-0x000007FEF5CCC000-memory.dmp

Filesize
9.9MB

Download
memory/1908-10-0x00000000003F0000-0x0000000000714000-memory.dmp

Filesize
3.1MB

Download
memory/1908-11-0x000007FEF52E0000-0x000007FEF5CCC000-memory.dmp

Filesize
9.9MB

Download
memory/1908-12-0x000007FEF52E0000-0x000007FEF5CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2420-0-0x000007FEF52E3000-0x000007FEF52E4000-memory.dmp

Filesize
4KB

Download
memory/2420-1-0x0000000001070000-0x0000000001394000-memory.dmp

Filesize
3.1MB

Download
memory/2420-2-0x000007FEF52E0000-0x000007FEF5CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2420-9-0x000007FEF52E0000-0x000007FEF5CCC000-memory.dmp

Filesize
9.9MB

Download