quasar | d08fbce12159858a1e805002d0100ad264d527df79f9c078bcb70737588cb03a

General

Target

1EAAC929BFEC99FBB06CF9871C9093BA.exe
Size

3.1MB
MD5

1eaac929bfec99fbb06cf9871c9093ba
SHA1

d9b10f8785e173e2f210a36dc10db3367a076338
SHA256

d08fbce12159858a1e805002d0100ad264d527df79f9c078bcb70737588cb03a
SHA512

776168a0584fdf426c3e26289bcf8f918c63da20b04013b7fc0c920da2620c3e08b1857c13fadf7dc61109d2afc964f6493b2b74e815109238941246db4d0752
SSDEEP

49152:yv9t62XlaSFNWPjljiFa2RoUYIoPeEErHXk/uVMoGd6+THHB72eh2NTX:yv/62XlaSFNWPjljiFXRoUYIoPePyK

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

45.95.214.119:1604

Mutex

f9f58545-e044-4981-817b-950eaa1429c9

Attributes

encryption_key
B45F6102F44CEBC69B790BA64CFCD6C9F8E03CE3
install_name
sys.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Skype
subdirectory
sys64

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4312-1-0x0000000000AC0000-0x0000000000DE4000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023c87-6.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

sys.exe

pid	Process
1228	sys.exe

Drops file in System32 directory 5 IoCs

Processes:

1EAAC929BFEC99FBB06CF9871C9093BA.exesys.exe

description	ioc	Process
File created	C:\Windows\system32\ sys64\sys.exe	1EAAC929BFEC99FBB06CF9871C9093BA.exe
File opened for modification	C:\Windows\system32\ sys64\sys.exe	1EAAC929BFEC99FBB06CF9871C9093BA.exe
File opened for modification	C:\Windows\system32\ sys64	1EAAC929BFEC99FBB06CF9871C9093BA.exe
File opened for modification	C:\Windows\system32\ sys64\sys.exe	sys.exe
File opened for modification	C:\Windows\system32\ sys64	sys.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

Processes:

schtasks.exeschtasks.exe

pid	Process
2676	schtasks.exe
3448	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

1EAAC929BFEC99FBB06CF9871C9093BA.exesys.exe

description	pid	Process
Token: SeDebugPrivilege	4312	1EAAC929BFEC99FBB06CF9871C9093BA.exe
Token: SeDebugPrivilege	1228	sys.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

1EAAC929BFEC99FBB06CF9871C9093BA.exesys.exe

description	pid	Process	procid_target
PID 4312 wrote to memory of 2676	4312	1EAAC929BFEC99FBB06CF9871C9093BA.exe	87
PID 4312 wrote to memory of 2676	4312	1EAAC929BFEC99FBB06CF9871C9093BA.exe	87
PID 4312 wrote to memory of 1228	4312	1EAAC929BFEC99FBB06CF9871C9093BA.exe	89
PID 4312 wrote to memory of 1228	4312	1EAAC929BFEC99FBB06CF9871C9093BA.exe	89
PID 1228 wrote to memory of 3448	1228	sys.exe	90
PID 1228 wrote to memory of 3448	1228	sys.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\1EAAC929BFEC99FBB06CF9871C9093BA.exe
"C:\Users\Admin\AppData\Local\Temp\1EAAC929BFEC99FBB06CF9871C9093BA.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4312
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Skype" /sc ONLOGON /tr "C:\Windows\system32\ sys64\sys.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2676
- C:\Windows\system32\ sys64\sys.exe
  "C:\Windows\system32\ sys64\sys.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1228
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Skype" /sc ONLOGON /tr "C:\Windows\system32\ sys64\sys.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3448

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\ sys64\sys.exe

Filesize
3.1MB

MD5
1eaac929bfec99fbb06cf9871c9093ba

SHA1
d9b10f8785e173e2f210a36dc10db3367a076338

SHA256
d08fbce12159858a1e805002d0100ad264d527df79f9c078bcb70737588cb03a

SHA512
776168a0584fdf426c3e26289bcf8f918c63da20b04013b7fc0c920da2620c3e08b1857c13fadf7dc61109d2afc964f6493b2b74e815109238941246db4d0752

Download Submit
memory/1228-9-0x00007FFC9E500000-0x00007FFC9EFC1000-memory.dmp

Filesize
10.8MB

Download
memory/1228-10-0x00007FFC9E500000-0x00007FFC9EFC1000-memory.dmp

Filesize
10.8MB

Download
memory/1228-11-0x000000001C0E0000-0x000000001C130000-memory.dmp

Filesize
320KB

Download
memory/1228-12-0x000000001C710000-0x000000001C7C2000-memory.dmp

Filesize
712KB

Download
memory/1228-15-0x000000001BFC0000-0x000000001BFD2000-memory.dmp

Filesize
72KB

Download
memory/1228-16-0x000000001C690000-0x000000001C6CC000-memory.dmp

Filesize
240KB

Download
memory/1228-18-0x00007FFC9E500000-0x00007FFC9EFC1000-memory.dmp

Filesize
10.8MB

Download
memory/4312-0-0x00007FFC9E503000-0x00007FFC9E505000-memory.dmp

Filesize
8KB

Download
memory/4312-1-0x0000000000AC0000-0x0000000000DE4000-memory.dmp

Filesize
3.1MB

Download
memory/4312-2-0x00007FFC9E500000-0x00007FFC9EFC1000-memory.dmp

Filesize
10.8MB

Download
memory/4312-17-0x00007FFC9E500000-0x00007FFC9EFC1000-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