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 2 IoCs

resource	yara_rule
behavioral2/files/0x000a000000023bc5-7.dat	family_quasar
behavioral2/memory/2836-16-0x00000000003B0000-0x00000000006D4000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	B658C5D7ED9CD9D40992885120E78450.exe

Executes dropped EXE 2 IoCs

pid	Process
2836	Client-built.exe
1828	Client.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

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

pid	Process
1400	schtasks.exe
3236	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2836	Client-built.exe
Token: SeDebugPrivilege	1828	Client.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1828	Client.exe
1828	Client.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
1828	Client.exe
1828	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1828	Client.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3596 wrote to memory of 2836	3596	B658C5D7ED9CD9D40992885120E78450.exe	87
PID 3596 wrote to memory of 2836	3596	B658C5D7ED9CD9D40992885120E78450.exe	87
PID 2836 wrote to memory of 1400	2836	Client-built.exe	88
PID 2836 wrote to memory of 1400	2836	Client-built.exe	88
PID 2836 wrote to memory of 1828	2836	Client-built.exe	90
PID 2836 wrote to memory of 1828	2836	Client-built.exe	90
PID 1828 wrote to memory of 3236	1828	Client.exe	93
PID 1828 wrote to memory of 3236	1828	Client.exe	93

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3596
- 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:2836
- - 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:1400
- - 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:1828
  - - 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:3236

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

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
e456f2449b504e6af29acb9c1e0ebd25

SHA1
4680b936eca2d5a88cbeed164b54a0b12f138892

SHA256
7ce80a4a4932516cf8163f73c85537e621b0a1e1a0c0fda41da1f71b1867dfc6

SHA512
ffe8788bae2143eb5b68f57edb3ded569bc1e75390bc48a7eb92e65a95688d34229039001d80f717f1c14e650fe94c01ec6e9438dac045af17569dc6811ab281

Download Submit
memory/1828-26-0x000000001C870000-0x000000001C8C0000-memory.dmp

Filesize
320KB

Download
memory/1828-27-0x000000001C980000-0x000000001CA32000-memory.dmp

Filesize
712KB

Download
memory/1828-30-0x000000001C900000-0x000000001C912000-memory.dmp

Filesize
72KB

Download
memory/1828-31-0x000000001D480000-0x000000001D4BC000-memory.dmp

Filesize
240KB

Download
memory/2836-14-0x00007FF988C13000-0x00007FF988C15000-memory.dmp

Filesize
8KB

Download
memory/2836-16-0x00000000003B0000-0x00000000006D4000-memory.dmp

Filesize
3.1MB

Download
memory/2836-18-0x00007FF988C10000-0x00007FF9896D1000-memory.dmp

Filesize
10.8MB

Download
memory/2836-25-0x00007FF988C10000-0x00007FF9896D1000-memory.dmp

Filesize
10.8MB

Download
memory/3596-3-0x00000000749C0000-0x0000000075170000-memory.dmp

Filesize
7.7MB

Download
memory/3596-1-0x0000000000C80000-0x0000000000FD0000-memory.dmp

Filesize
3.3MB

Download
memory/3596-17-0x00000000749C0000-0x0000000075170000-memory.dmp

Filesize
7.7MB

Download
memory/3596-0-0x00000000749CE000-0x00000000749CF000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads