quasar | 36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291

General

Target

B658C5D7ED9CD9D40992885120E78450.exe
Size

3.3MB
MD5

b658c5d7ed9cd9d40992885120e78450
SHA1

a96eede3e39827b1f975c1dfdec8917b981f1330
SHA256

36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291
SHA512

62e9bfc7fac1e3a26ba3578f49d800793c5ffa02bb61786c600c69808424047285a297438075c40539fb96cbea4652a1bfdcf36e5b86b9a0687c6f67502855be
SSDEEP

98304:smDurDWcs5SUUhjH5iv1B/fGJD21MV4tJ+r3dXmJ:smOW5Chj5iv1B/fED21mrgJ

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

83.168.110.87:4782

Mutex

e7550a93-a385-490f-a2f8-5d9e1b5fd98b

Attributes

encryption_key
19FB99CC4D38C38330C88E623B7FD5B15277B769
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
puttystart
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/files/0x0007000000012117-5.dat	family_quasar
behavioral1/memory/2680-11-0x0000000000DE0000-0x0000000001104000-memory.dmp	family_quasar
behavioral1/memory/2668-18-0x0000000000850000-0x0000000000B74000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

Processes:

Client-built.exeClient.exe

pid	Process
2680	Client-built.exe
2668	Client.exe

Loads dropped DLL 1 IoCs

Processes:

B658C5D7ED9CD9D40992885120E78450.exe

pid	Process
2856	B658C5D7ED9CD9D40992885120E78450.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

B658C5D7ED9CD9D40992885120E78450.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	B658C5D7ED9CD9D40992885120E78450.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
2852	schtasks.exe
1408	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2680	Client-built.exe
Token: SeDebugPrivilege	2668	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid	Process
2668	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid	Process
2668	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
2668	Client.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

B658C5D7ED9CD9D40992885120E78450.exeClient-built.exeClient.exe

description	pid	Process	procid_target
PID 2856 wrote to memory of 2680	2856	B658C5D7ED9CD9D40992885120E78450.exe	31
PID 2856 wrote to memory of 2680	2856	B658C5D7ED9CD9D40992885120E78450.exe	31
PID 2856 wrote to memory of 2680	2856	B658C5D7ED9CD9D40992885120E78450.exe	31
PID 2856 wrote to memory of 2680	2856	B658C5D7ED9CD9D40992885120E78450.exe	31
PID 2680 wrote to memory of 2852	2680	Client-built.exe	32
PID 2680 wrote to memory of 2852	2680	Client-built.exe	32
PID 2680 wrote to memory of 2852	2680	Client-built.exe	32
PID 2680 wrote to memory of 2668	2680	Client-built.exe	34
PID 2680 wrote to memory of 2668	2680	Client-built.exe	34
PID 2680 wrote to memory of 2668	2680	Client-built.exe	34
PID 2668 wrote to memory of 1408	2668	Client.exe	35
PID 2668 wrote to memory of 1408	2668	Client.exe	35
PID 2668 wrote to memory of 1408	2668	Client.exe	35

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\B658C5D7ED9CD9D40992885120E78450.exe
"C:\Users\Admin\AppData\Local\Temp\B658C5D7ED9CD9D40992885120E78450.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2856
- C:\Users\Admin\AppData\Local\Temp\Client-built.exe
  "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2680
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "puttystart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2852
- - 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 FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2668
  - - C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "puttystart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1408

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

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Local\Temp\Client-built.exe

Filesize
3.1MB

MD5
e456f2449b504e6af29acb9c1e0ebd25

SHA1
4680b936eca2d5a88cbeed164b54a0b12f138892

SHA256
7ce80a4a4932516cf8163f73c85537e621b0a1e1a0c0fda41da1f71b1867dfc6

SHA512
ffe8788bae2143eb5b68f57edb3ded569bc1e75390bc48a7eb92e65a95688d34229039001d80f717f1c14e650fe94c01ec6e9438dac045af17569dc6811ab281

Download Submit
memory/2668-18-0x0000000000850000-0x0000000000B74000-memory.dmp

Filesize
3.1MB

Download
memory/2680-10-0x000007FEF4E53000-0x000007FEF4E54000-memory.dmp

Filesize
4KB

Download
memory/2680-11-0x0000000000DE0000-0x0000000001104000-memory.dmp

Filesize
3.1MB

Download
memory/2680-12-0x000007FEF4E50000-0x000007FEF583C000-memory.dmp

Filesize
9.9MB

Download
memory/2680-19-0x000007FEF4E50000-0x000007FEF583C000-memory.dmp

Filesize
9.9MB

Download
memory/2856-0-0x0000000073EAE000-0x0000000073EAF000-memory.dmp

Filesize
4KB

Download
memory/2856-1-0x00000000000D0000-0x0000000000420000-memory.dmp

Filesize
3.3MB

Download
memory/2856-2-0x0000000073EA0000-0x000000007458E000-memory.dmp

Filesize
6.9MB

Download
memory/2856-9-0x0000000073EA0000-0x000000007458E000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads