quasar | e34034dbb4cbb553b51e609d2163e05898b8691d4697ebffd0e26dadc4e904ed

General

Target
2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe
Size 4.7MB
Sample240503-hntvvabe53
SHA256 e34034dbb4cbb553b51e609d2163e05898b8691d4697ebffd0e26dadc4e904ed
MD5 7209a91ded834143f4268f22b3365f19
SHA1 307ef53a216893dd5561952f09e28a859be9d378
SHA512 b6563ffa620208a73ac250a27525be9062cc49f7575c332b480a8a3e2edc51247aa284ce4cc30fe4c8cfa13f439d4ab44f387fc3c8f5ec8d2859641eca77b5ad
SSDEEP 98304:0k47/wbQvr22SsaNYfdPBldt6+dBcjHtKRJ6BlIbzZ5IbzZR:0ZvM7jGIKsj
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

mx5.deitie.asia:4495

Mutex

ebbf737a-dddd-43dd-9b0a-74831302455d

Attributes

encryption_key
F8516D89A1DFD78BD8FF575BBC3AE828B47FF0E1
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000023b6a-2.dat	family_quasar
behavioral2/memory/1836-5-0x0000000000E30000-0x0000000001154000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000023b6a-2.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/1836-5-0x0000000000E30000-0x0000000001154000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000023b6a-2.dat	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral2/memory/1836-5-0x0000000000E30000-0x0000000001154000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000023b6a-2.dat	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral2/memory/1836-5-0x0000000000E30000-0x0000000001154000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe	2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe

Executes dropped EXE 2 IoCs

pid	Process
1836	sign.exe
3204	Client.exe

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

pid	Process
4696	schtasks.exe
1476	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4032	2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe
4032	2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1836	sign.exe
Token: SeDebugPrivilege	3204	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4032	2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe
4032	2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4032 wrote to memory of 1836	4032	2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe	83
PID 4032 wrote to memory of 1836	4032	2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe	83
PID 1836 wrote to memory of 4696	1836	sign.exe	87
PID 1836 wrote to memory of 4696	1836	sign.exe	87
PID 1836 wrote to memory of 3204	1836	sign.exe	89
PID 1836 wrote to memory of 3204	1836	sign.exe	89
PID 3204 wrote to memory of 1476	3204	Client.exe	90
PID 3204 wrote to memory of 1476	3204	Client.exe	90

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\2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-03_7209a91ded834143f4268f22b3365f19_icedid_quasar-rat_xrat.exe"
1⤵
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4032
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\\sign.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1836
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4696
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3204
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      4⤵
      Creates scheduled task(s)
      PID:1476

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

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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sign.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe
Size 3.1MB
SHA256 44089202623b9671051aa5bba5e72f81f68ce818c3054dde57726aaa6dcb9ff7
MD5 7498d554976744dfbd271ba755c6c192
SHA1 ec733d01e776518e387d2f51d1a6559b81f03b1e
SHA512 d4e987d0e6235001fac4ae3a634e8fe98c6830e26a6a6876fbc36262842688d3ec301cff75003d2af695cdfd357ac50919946695b7d5d3293ebcba97153e1030
SSDEEP 49152:KvmI22SsaNYfdPBldt698dBcjHtKRJ6vbR3LoGd8PTHHB72eh2NT:Kvr22SsaNYfdPBldt6+dBcjHtKRJ6B
MD5 SHA1 SHA512 SSDEEP

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memory/1836-4-0x00007FFE63E03000-0x00007FFE63E05000-memory.dmp

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memory/1836-5-0x0000000000E30000-0x0000000001154000-memory.dmp

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memory/1836-6-0x00007FFE63E00000-0x00007FFE648C1000-memory.dmp

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memory/1836-13-0x00007FFE63E00000-0x00007FFE648C1000-memory.dmp

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memory/3204-14-0x00007FFE63E00000-0x00007FFE648C1000-memory.dmp

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memory/3204-15-0x000000001BA50000-0x000000001BAA0000-memory.dmp

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memory/3204-16-0x000000001C1C0000-0x000000001C272000-memory.dmp

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memory/3204-17-0x00007FFE63E00000-0x00007FFE648C1000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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