quasar | 91317ced2f4f13e3a9e32d85481811ac7ec8a497057f5b103a9d13915df9bd04

General

Target

PERM.exe
Size

3.1MB
MD5

b0dd954ceb8a6f5f328c999877c8aae8
SHA1

1a312b40a820e819f25ade7cbe633aad104855f3
SHA256

91317ced2f4f13e3a9e32d85481811ac7ec8a497057f5b103a9d13915df9bd04
SHA512

3b2c519990213dbff799849e244650024eb449d37f7124eb0d645cac6619bd3875e27b6446c6016a75fed3bf24e0f3aa252dbddc5a3652e0a3f376097c519fa7
SSDEEP

49152:3vyI22SsaNYfdPBldt698dBcjH4oDkE2Hqk/+FpoGdOTHHB72eh2NT:3vf22SsaNYfdPBldt6+dBcjH4oDXr

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.115:4782

Mutex

0d2a5ea8-389a-4ca3-80ef-f0a24450d17f

Attributes

encryption_key
CEBBCD296E028BCC0E5B98A92D532CD6055F1E6C
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
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/memory/3984-1-0x0000000000970000-0x0000000000C94000-memory.dmp	family_quasar
behavioral2/files/0x001d00000002ab30-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1396	Client.exe

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4249425805-3408538557-1766626484-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoftwindows.client.cbs_cw5n1h2txyewy\Internet Settings\Cache\Content\CachePrefix	BackgroundTransferHost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4249425805-3408538557-1766626484-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoftwindows.client.cbs_cw5n1h2txyewy\Internet Settings\Cache\Cookies\CachePrefix = "Cookie:"	BackgroundTransferHost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4249425805-3408538557-1766626484-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoftwindows.client.cbs_cw5n1h2txyewy\Internet Settings\Cache\History\CachePrefix = "Visited:"	BackgroundTransferHost.exe
Key created	\REGISTRY\USER\S-1-5-21-4249425805-3408538557-1766626484-1000_Classes\Local Settings\MuiCache	MiniSearchHost.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
3328	schtasks.exe
2096	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3984	PERM.exe
Token: SeDebugPrivilege	1396	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1396	Client.exe
4380	MiniSearchHost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3984 wrote to memory of 3328	3984	PERM.exe	77
PID 3984 wrote to memory of 3328	3984	PERM.exe	77
PID 3984 wrote to memory of 1396	3984	PERM.exe	79
PID 3984 wrote to memory of 1396	3984	PERM.exe	79
PID 1396 wrote to memory of 2096	1396	Client.exe	80
PID 1396 wrote to memory of 2096	1396	Client.exe	80

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\PERM.exe
"C:\Users\Admin\AppData\Local\Temp\PERM.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3984
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3328
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1396
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2096

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:2240

C:\Windows\system32\BackgroundTransferHost.exe
"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.13
1⤵
- Modifies registry class
PID:3928

C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4380

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:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

Filesize
10KB

MD5
96329c73cc49cd960e2485210d01c4d2

SHA1
a496b98ad2f2bbf26687b5b7794a26aa4470148e

SHA256
4c159cab6c9ef5ff39e6141b0ccb5b8c6251a3d637520609dfbdd852fa94d466

SHA512
e98736a879cad24c693d6c5939654b2fd25bf9d348f738668624214f22d541a9b781c967201ab2d43cbac9207946824a0299d482485f4b63c48d5d2a839e5baf

Download Submit
C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

Filesize
10KB

MD5
847a64ce22adca83e091e5403ef844ed

SHA1
f2cf8559f0eba3d237cee1162b811613d2a0c308

SHA256
1db255895b125edbed50b5296edafaf303dde2b93a600313b6a1aa61f9ec2b88

SHA512
94abff56e498bfd7af0e72a652a0b03d29cbe7d0322f43cb8fa4182cfa829ec6d608c5bb3f6deaaf1dcaae764c90036beedb503109c8080999dfaf2d6a2e9de6

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
b0dd954ceb8a6f5f328c999877c8aae8

SHA1
1a312b40a820e819f25ade7cbe633aad104855f3

SHA256
91317ced2f4f13e3a9e32d85481811ac7ec8a497057f5b103a9d13915df9bd04

SHA512
3b2c519990213dbff799849e244650024eb449d37f7124eb0d645cac6619bd3875e27b6446c6016a75fed3bf24e0f3aa252dbddc5a3652e0a3f376097c519fa7

Download Submit
memory/1396-11-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp

Filesize
10.8MB

Download
memory/1396-10-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp

Filesize
10.8MB

Download
memory/1396-12-0x000000001C3C0000-0x000000001C410000-memory.dmp

Filesize
320KB

Download
memory/1396-13-0x000000001C4D0000-0x000000001C582000-memory.dmp

Filesize
712KB

Download
memory/1396-14-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp

Filesize
10.8MB

Download
memory/1396-15-0x000000001CCC0000-0x000000001D1E8000-memory.dmp

Filesize
5.2MB

Download
memory/3984-9-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp

Filesize
10.8MB

Download
memory/3984-0-0x00007FFD38193000-0x00007FFD38195000-memory.dmp

Filesize
8KB

Download
memory/3984-2-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp

Filesize
10.8MB

Download
memory/3984-1-0x0000000000970000-0x0000000000C94000-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