quasar | 164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f

Analysis

max time kernel
124s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
18-06-2024 11:25

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General

Target

KR6nDu9fLhop1bFe.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 2 IoCs

Processes:

resource yara_rule

behavioral2/memory/4972-1-0x0000000000E70000-0x0000000001194000-memory.dmp family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe family_quasar
Executes dropped EXE 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

4132 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

3628 schtasks.exe
3276 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

KR6nDu9fLhop1bFe.exeKR6nDu9fLhop1bFe.exe

description pid process

Token: SeDebugPrivilege 4972 KR6nDu9fLhop1bFe.exe
Token: SeDebugPrivilege 4132 KR6nDu9fLhop1bFe.exe
Suspicious use of FindShellTrayWindow 3 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

4132 KR6nDu9fLhop1bFe.exe
4132 KR6nDu9fLhop1bFe.exe
4132 KR6nDu9fLhop1bFe.exe
Suspicious use of SendNotifyMessage 3 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

4132 KR6nDu9fLhop1bFe.exe
4132 KR6nDu9fLhop1bFe.exe
4132 KR6nDu9fLhop1bFe.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

4132 KR6nDu9fLhop1bFe.exe

resource	yara_rule
behavioral2/memory/4972-1-0x0000000000E70000-0x0000000001194000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe	family_quasar

pid	process
4132	KR6nDu9fLhop1bFe.exe

pid	process
3628	schtasks.exe
3276	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4972	KR6nDu9fLhop1bFe.exe
Token: SeDebugPrivilege	4132	KR6nDu9fLhop1bFe.exe

pid	process
4132	KR6nDu9fLhop1bFe.exe
4132	KR6nDu9fLhop1bFe.exe
4132	KR6nDu9fLhop1bFe.exe

pid	process
4132	KR6nDu9fLhop1bFe.exe
4132	KR6nDu9fLhop1bFe.exe
4132	KR6nDu9fLhop1bFe.exe

pid	process
4132	KR6nDu9fLhop1bFe.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

KR6nDu9fLhop1bFe.exeKR6nDu9fLhop1bFe.exe

description	pid	process	target process
PID 4972 wrote to memory of 3628	4972	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 4972 wrote to memory of 3628	4972	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 4972 wrote to memory of 4132	4972	KR6nDu9fLhop1bFe.exe	KR6nDu9fLhop1bFe.exe
PID 4972 wrote to memory of 4132	4972	KR6nDu9fLhop1bFe.exe	KR6nDu9fLhop1bFe.exe
PID 4132 wrote to memory of 3276	4132	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 4132 wrote to memory of 3276	4132	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\KR6nDu9fLhop1bFe.exe
"C:\Users\Admin\AppData\Local\Temp\KR6nDu9fLhop1bFe.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4972

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:3628

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:4132

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:3276

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3584,i,6041070687820623968,3004230300437737550,262144 --variations-seed-version --mojo-platform-channel-handle=4344 /prefetch:8
1⤵
PID:1460

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\KR6nDu9fLhop1bFe.exe.log
Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

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

MD5
1b27e622f4edbbdd8fc93a0d1c129607

SHA1
3e7b42dd10c01f632f158cc96701f6ba49ebec48

SHA256
164e19d48c8d3ed423d4d4c68dff47899f375b6ef4f2a27005562e16b3a8d33f

SHA512
bd6d609019f06649db920244a91ef5a2f105ea81055cdd53df72e737e1aae75b340060f45cb56383d201c154591a0a297fd69e1d09c5239b96ea5765a823ef5c

Download Submit
memory/4132-11-0x00007FFD92FD0000-0x00007FFD93A91000-memory.dmp

Filesize
10.8MB

Download
memory/4132-12-0x00007FFD92FD0000-0x00007FFD93A91000-memory.dmp

Filesize
10.8MB

Download
memory/4132-13-0x000000001DB10000-0x000000001DB60000-memory.dmp

Filesize
320KB

Download
memory/4132-14-0x000000001DC20000-0x000000001DCD2000-memory.dmp

Filesize
712KB

Download
memory/4132-15-0x000000001DB80000-0x000000001DB92000-memory.dmp

Filesize
72KB

Download
memory/4132-16-0x000000001DBE0000-0x000000001DC1C000-memory.dmp

Filesize
240KB

Download
memory/4132-17-0x00007FFD92FD0000-0x00007FFD93A91000-memory.dmp

Filesize
10.8MB

Download
memory/4972-2-0x00007FFD92FD0000-0x00007FFD93A91000-memory.dmp

Filesize
10.8MB

Download
memory/4972-1-0x0000000000E70000-0x0000000001194000-memory.dmp

Filesize
3.1MB

Download
memory/4972-10-0x00007FFD92FD0000-0x00007FFD93A91000-memory.dmp

Filesize
10.8MB

Download
memory/4972-0-0x00007FFD92FD3000-0x00007FFD92FD5000-memory.dmp

Filesize
8KB

Download