quasar | 7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053

General

Target

7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe
Size

2.8MB
MD5

4a1c798e636efe865b30ec8576fd6200
SHA1

ee37036fd610ebc79cb119b0094143fbb521989b
SHA256

7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053
SHA512

60da6dfcfc431855d3316f263c7d0fec8ff363fe55f1847c7ab4ec5095a7f793653849cb2253b1dbb6de8d7d9bb7829a040ebe2e77fb72c2a102e677df63e4a3
SSDEEP

49152:B/mf57XLMVRp8NsPUtugv4p+hfXq9C4RJjMuRGYd34rgReGKw7CKQ3:CMVoscup+hSfRJwtWmPnw7CF

Score

10^/10

quasar plmso discovery spyware trojan upx

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Plmso

C2

110.42.3.134:4782

Mutex

41ace1c3-9f4e-4d35-93fb-096ede244c3e

Attributes

encryption_key
980DB384AAAF5B8591D5B450BFA39547F61611DC
install_name
System.exe
log_directory
Logs
reconnect_delay
3000
startup_key
System
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/0x0007000000023cb5-16.dat	family_quasar
behavioral2/memory/3564-26-0x0000000000B70000-0x0000000000E94000-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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe

Executes dropped EXE 3 IoCs

pid	Process
1148	MHClient-PLMHO.exe
3564	Client-built.exe
4452	System.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\System.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\System.exe	System.exe
File opened for modification	C:\Windows\system32\SubDir	System.exe
File created	C:\Windows\system32\SubDir\System.exe	Client-built.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4316-0-0x0000000000400000-0x000000000041C000-memory.dmp	upx
behavioral2/memory/4316-24-0x0000000000400000-0x000000000041C000-memory.dmp	upx

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 2 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	7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MHClient-PLMHO.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
3632	schtasks.exe
1372	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3564	Client-built.exe
Token: SeDebugPrivilege	4452	System.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4316 wrote to memory of 1148	4316	7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe	83
PID 4316 wrote to memory of 1148	4316	7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe	83
PID 4316 wrote to memory of 1148	4316	7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe	83
PID 4316 wrote to memory of 3564	4316	7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe	84
PID 4316 wrote to memory of 3564	4316	7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe	84
PID 3564 wrote to memory of 3632	3564	Client-built.exe	85
PID 3564 wrote to memory of 3632	3564	Client-built.exe	85
PID 3564 wrote to memory of 4452	3564	Client-built.exe	87
PID 3564 wrote to memory of 4452	3564	Client-built.exe	87
PID 4452 wrote to memory of 1372	4452	System.exe	88
PID 4452 wrote to memory of 1372	4452	System.exe	88

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\7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe
"C:\Users\Admin\AppData\Local\Temp\7081010e6695eb675cb7a4fe3c27eeeb82cd9f550d1f016eb0e130f0725cb053N.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4316
- C:\Users\Admin\AppData\Local\Temp\Temp\MHClient-PLMHO.exe
  "C:\Users\Admin\AppData\Local\Temp\Temp\MHClient-PLMHO.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:1148
- C:\Users\Admin\AppData\Local\Temp\Temp\Client-built.exe
  "C:\Users\Admin\AppData\Local\Temp\Temp\Client-built.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3564
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Windows\system32\SubDir\System.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3632
- - C:\Windows\system32\SubDir\System.exe
    "C:\Windows\system32\SubDir\System.exe"
    3⤵
    - Executes dropped EXE
    - Drops file in System32 directory
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4452
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Windows\system32\SubDir\System.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1372

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

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Downloads

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

Filesize
3.1MB

MD5
3f91e95692f667285e1a1213e61fe2a0

SHA1
ad5335b29b844f5d125f563693e2f029df4eba3a

SHA256
12129040a48af189e394c31a0492a90669596bb7194a0753de7cdac9973fb5de

SHA512
ebc9ae6d1e8ca6f3b56622c64f266a4b0e2c9154e427a3d1050f5512f7cb9afc4daad0681f0585b6db6fe43106e93f56a6dfd468055b98ff5186c976fd9ae363

Download Submit
C:\Users\Admin\AppData\Local\Temp\Temp\MHClient-PLMHO.exe

Filesize
5.8MB

MD5
d3b958b776d2269fed0d06db091da5f6

SHA1
ede319c947a83c7b59b5d0a00d29bb311b6aadbd

SHA256
f7685db34fa42c7e5754da2e248125db525595f50c702186e708d219ccaac5ef

SHA512
e7abd6202f2d6db2a95b28ead739ee11198898f93f93c2fbaeed352a2a8a1c43fc30fdda9f22d7c3890cb6adc4bdfc9c24526ebdfc7042eb8b6b6ba941e6273d

Download Submit
memory/3564-25-0x00007FFBE8CC3000-0x00007FFBE8CC5000-memory.dmp

Filesize
8KB

Download
memory/3564-26-0x0000000000B70000-0x0000000000E94000-memory.dmp

Filesize
3.1MB

Download
memory/3564-27-0x00007FFBE8CC0000-0x00007FFBE9781000-memory.dmp

Filesize
10.8MB

Download
memory/3564-34-0x00007FFBE8CC0000-0x00007FFBE9781000-memory.dmp

Filesize
10.8MB

Download
memory/4316-0-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4316-24-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4452-35-0x000000001BB10000-0x000000001BB60000-memory.dmp

Filesize
320KB

Download
memory/4452-36-0x000000001BC20000-0x000000001BCD2000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads