asyncrat | c633b31880ac53ee6282c0d7a7daae5c9ecc024055de85b77a17ffe9be5ebe08

General

Target

fixer.exe
Size

49KB
MD5

041086a69579dc26514645814a4bba5c
SHA1

07c7bf2bf5953ba3369ab727ff8a06e93fc2ccfd
SHA256

c633b31880ac53ee6282c0d7a7daae5c9ecc024055de85b77a17ffe9be5ebe08
SHA512

07a18aa25f2b201613e26c5c50aef20b8d2d77b2a89ac983ee00d4ed223f6dbdec424b673735baa22b76d6fb31367de912ad56e8066c8e470bcb886e1959dd77
SSDEEP

768:aBxKJlVRLxt5A0fjXiqVNcr4Lp2FimUbgCxB/yzuoxGZkpqKYhY7:f37/jXi+L7NECvyzz4kpqKmY7

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

127.0.0.1:35259

147.185.221.19:35259

Attributes

delay
1
install
true
install_file
MS_EDGE_TEMP_.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 3 IoCs

rat

resource	yara_rule
behavioral2/memory/4268-1-0x0000000001280000-0x0000000001296000-memory.dmp	family_asyncrat
behavioral2/files/0x0008000000023423-14.dat	family_asyncrat
behavioral2/memory/1016-17-0x00000000010C0000-0x00000000010D6000-memory.dmp	family_asyncrat

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-1-5-21-4084619521-2220719027-1909462854-1000\Control Panel\International\Geo\Nation	fixer.exe

Executes dropped EXE 1 IoCs

pid	Process
1016	MS_EDGE_TEMP_.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3320	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4756	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe
4268	fixer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4268	fixer.exe
Token: SeDebugPrivilege	1016	MS_EDGE_TEMP_.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4268 wrote to memory of 2644	4268	fixer.exe	88
PID 4268 wrote to memory of 2644	4268	fixer.exe	88
PID 4268 wrote to memory of 3156	4268	fixer.exe	90
PID 4268 wrote to memory of 3156	4268	fixer.exe	90
PID 2644 wrote to memory of 3320	2644	cmd.exe	92
PID 2644 wrote to memory of 3320	2644	cmd.exe	92
PID 3156 wrote to memory of 4756	3156	cmd.exe	93
PID 3156 wrote to memory of 4756	3156	cmd.exe	93
PID 3156 wrote to memory of 1016	3156	cmd.exe	98
PID 3156 wrote to memory of 1016	3156	cmd.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:\Users\Admin\AppData\Local\Temp\fixer.exe
"C:\Users\Admin\AppData\Local\Temp\fixer.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4268
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "MS_EDGE_TEMP_" /tr '"C:\Users\Admin\AppData\Roaming\MS_EDGE_TEMP_.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2644
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "MS_EDGE_TEMP_" /tr '"C:\Users\Admin\AppData\Roaming\MS_EDGE_TEMP_.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:3320
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD273.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3156
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4756
- - C:\Users\Admin\AppData\Roaming\MS_EDGE_TEMP_.exe
    "C:\Users\Admin\AppData\Roaming\MS_EDGE_TEMP_.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1016

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpD273.tmp.bat

Filesize
157B

MD5
d72153d93e5c2de449554e4789c3aab1

SHA1
eb44e8671ed69f9ce27bba3462644b4bbf4422f9

SHA256
17900eaaf4a5f806a1547b1d2f732feaf4878d1f66b63071792beace80bc4e5f

SHA512
f0bb5b11cdde79ed91581d3bec5e0864dd1a2414c6471016ccac6d750d26bab19247651b60dab7a6c378b30a30949fd4f97ba655d18a575a4e5a57028352a557

Download Submit
C:\Users\Admin\AppData\Roaming\MS_EDGE_TEMP_.exe

Filesize
49KB

MD5
041086a69579dc26514645814a4bba5c

SHA1
07c7bf2bf5953ba3369ab727ff8a06e93fc2ccfd

SHA256
c633b31880ac53ee6282c0d7a7daae5c9ecc024055de85b77a17ffe9be5ebe08

SHA512
07a18aa25f2b201613e26c5c50aef20b8d2d77b2a89ac983ee00d4ed223f6dbdec424b673735baa22b76d6fb31367de912ad56e8066c8e470bcb886e1959dd77

Download Submit
memory/1016-20-0x000000001B6D0000-0x000000001B6E0000-memory.dmp

Filesize
64KB

Download
memory/1016-19-0x00007FF84C860000-0x00007FF84D321000-memory.dmp

Filesize
10.8MB

Download
memory/1016-18-0x000000001B6D0000-0x000000001B6E0000-memory.dmp

Filesize
64KB

Download
memory/1016-17-0x00000000010C0000-0x00000000010D6000-memory.dmp

Filesize
88KB

Download
memory/1016-16-0x00007FF84C860000-0x00007FF84D321000-memory.dmp

Filesize
10.8MB

Download
memory/4268-3-0x000000001BA80000-0x000000001BA90000-memory.dmp

Filesize
64KB

Download
memory/4268-11-0x00007FF86AAD0000-0x00007FF86ACC5000-memory.dmp

Filesize
2.0MB

Download
memory/4268-10-0x00007FF84CA60000-0x00007FF84D521000-memory.dmp

Filesize
10.8MB

Download
memory/4268-9-0x00007FF857DC0000-0x00007FF857DD9000-memory.dmp

Filesize
100KB

Download
memory/4268-6-0x00007FF86AAD0000-0x00007FF86ACC5000-memory.dmp

Filesize
2.0MB

Download
memory/4268-0-0x0000000000CD0000-0x0000000000CE2000-memory.dmp

Filesize
72KB

Download
memory/4268-2-0x00007FF84CA60000-0x00007FF84D521000-memory.dmp

Filesize
10.8MB

Download
memory/4268-1-0x0000000001280000-0x0000000001296000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads