quasar | c5b4e58eb2e88122301ee2569a31632857284c1a89ac2d3670cc1576ec1a6a73

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
01/04/2025, 16:20

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General

Target

RuntimeBroker.exe
Size

3.1MB
MD5

61a3f6d8dab4b5349757ca1b7b76e2bb
SHA1

6eba02e441024178612e86ac2036c4f539305bc8
SHA256

c5b4e58eb2e88122301ee2569a31632857284c1a89ac2d3670cc1576ec1a6a73
SHA512

c96105ae7152c1cb5db73ebcd286e93988b8d3574e8a5958883fb06d397cfac65b8515745b823db3dd40b6ea157a284565b34cc170d1dc2872a3dbb78edda911
SSDEEP

49152:vvSe821/aQWl8P0lSk3aKA3Z+nUlRJ6abR3LoGdHTHHB72eh2NT:vvp821/aQWl8P0lSk3DA3Z+nUlRJ60

Score

10^/10

quasar virgen spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

VIRGEN

holefo2785-22820.portmap.host:22820

Mutex

2aade54c-f664-4620-a4fa-9372bacfbe94

Attributes

encryption_key
14B98F14C8A2574E32B0396E72660E0C80B14AC2
install_name
RuntimeBroker.exe
log_directory
Logs
reconnect_delay
1000
startup_key
Runtime Broker
subdirectory
migration

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/876-1-0x0000000000940000-0x0000000000C64000-memory.dmp	family_quasar
behavioral1/files/0x0007000000024310-4.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3596	RuntimeBroker.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\migration\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\migration\RuntimeBroker.exe	RuntimeBroker.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
4564	schtasks.exe
2692	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	876	RuntimeBroker.exe
Token: SeDebugPrivilege	3596	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 876 wrote to memory of 2692	876	RuntimeBroker.exe	89
PID 876 wrote to memory of 2692	876	RuntimeBroker.exe	89
PID 876 wrote to memory of 3596	876	RuntimeBroker.exe	91
PID 876 wrote to memory of 3596	876	RuntimeBroker.exe	91
PID 3596 wrote to memory of 4564	3596	RuntimeBroker.exe	92
PID 3596 wrote to memory of 4564	3596	RuntimeBroker.exe	92

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\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:876
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\migration\RuntimeBroker.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2692
- C:\Windows\system32\migration\RuntimeBroker.exe
  "C:\Windows\system32\migration\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3596
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\migration\RuntimeBroker.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4564

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RuntimeBroker.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Windows\System32\migration\RuntimeBroker.exe

Filesize
3.1MB

MD5
61a3f6d8dab4b5349757ca1b7b76e2bb

SHA1
6eba02e441024178612e86ac2036c4f539305bc8

SHA256
c5b4e58eb2e88122301ee2569a31632857284c1a89ac2d3670cc1576ec1a6a73

SHA512
c96105ae7152c1cb5db73ebcd286e93988b8d3574e8a5958883fb06d397cfac65b8515745b823db3dd40b6ea157a284565b34cc170d1dc2872a3dbb78edda911

Download Submit
memory/876-0-0x00007FF8D7673000-0x00007FF8D7675000-memory.dmp

Filesize
8KB

Download
memory/876-1-0x0000000000940000-0x0000000000C64000-memory.dmp

Filesize
3.1MB

Download
memory/3596-8-0x00007FF8D7670000-0x00007FF8D8131000-memory.dmp

Filesize
10.8MB

Download
memory/3596-9-0x000000001BD50000-0x000000001BDA0000-memory.dmp

Filesize
320KB

Download
memory/3596-10-0x000000001BE60000-0x000000001BF12000-memory.dmp

Filesize
712KB

Download
memory/3596-11-0x00007FF8D7670000-0x00007FF8D8131000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads