xloader | 660d63fb00fa5f47737a5b22014f8bdf22080722ac16da61216caa5e99210b65

General

Target

$PLUGINSDIR/rrkssezi.dll
Size

20KB
MD5

0b9de97b386a1a82cee5d3e059b7ec9b
SHA1

cc730fba70941afa39a9827fea215c9f099a6d01
SHA256

ad29dd53baa1e19fe4cacd99b9dea3b6e7fba8c6d89fe0492244de4414948e21
SHA512

b36cef8eb5fdf990ed79fd718a250e6f736e585516b4cfc97b7a0aba6f254e8997d8cf0262b0f4a894dc91e13c2b22aaa1eac554c2e23c42e50e8bc2fae3ad3d
SSDEEP

384:cYwn4GqWlh1i9E8LB2T35YjzYDYp0fRBtsoudoq0HNyp:7wnskhU6tTuYkpoudohy

Score

10^/10

xloader uar3 discovery loader rat

Malware Config

Extracted

Family

xloader

Version

2.5

Campaign

uar3

Decoy

sgadvocats.com

mjscannabus.com

hilldaley.com

ksdollhouse.com

hotgiftboutique.com

purebloodsmeet.com

relaunched.info

cap-glove.com

productcollection.store

fulikyy.xyz

remoteaviationjobs.com

bestcleancrystal.com

virtualorganizationpartner.com

bookgocar.com

hattuafhv.quest

makonigroup.com

officecom-myaccount.com

malgorzata-lac.com

e-learningeducators.com

hygilaur.com

Signatures

Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader
Xloader family
xloader

Xloader payload 4 IoCs

rat

resource	yara_rule
behavioral3/memory/3044-1-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral3/memory/3044-5-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral3/memory/3044-9-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral3/memory/2880-14-0x00000000000C0000-0x00000000000E9000-memory.dmp	xloader

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2996 set thread context of 3044	2996	rundll32.exe	31
PID 3044 set thread context of 1192	3044	rundll32.exe	21
PID 3044 set thread context of 1192	3044	rundll32.exe	21
PID 2880 set thread context of 1192	2880	chkdsk.exe	21

System Location Discovery: System Language Discovery 1 TTPs 4 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	chkdsk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
3044	rundll32.exe
3044	rundll32.exe
3044	rundll32.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe
2880	chkdsk.exe

Suspicious behavior: MapViewOfSection 6 IoCs

pid	Process
3044	rundll32.exe
3044	rundll32.exe
3044	rundll32.exe
3044	rundll32.exe
2880	chkdsk.exe
2880	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3044	rundll32.exe
Token: SeDebugPrivilege	2880	chkdsk.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2984 wrote to memory of 2996	2984	rundll32.exe	30
PID 2984 wrote to memory of 2996	2984	rundll32.exe	30
PID 2984 wrote to memory of 2996	2984	rundll32.exe	30
PID 2984 wrote to memory of 2996	2984	rundll32.exe	30
PID 2984 wrote to memory of 2996	2984	rundll32.exe	30
PID 2984 wrote to memory of 2996	2984	rundll32.exe	30
PID 2984 wrote to memory of 2996	2984	rundll32.exe	30
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 2996 wrote to memory of 3044	2996	rundll32.exe	31
PID 1192 wrote to memory of 2880	1192	Explorer.EXE	40
PID 1192 wrote to memory of 2880	1192	Explorer.EXE	40
PID 1192 wrote to memory of 2880	1192	Explorer.EXE	40
PID 1192 wrote to memory of 2880	1192	Explorer.EXE	40
PID 2880 wrote to memory of 2268	2880	chkdsk.exe	41
PID 2880 wrote to memory of 2268	2880	chkdsk.exe	41
PID 2880 wrote to memory of 2268	2880	chkdsk.exe	41
PID 2880 wrote to memory of 2268	2880	chkdsk.exe	41

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1192
- C:\Windows\system32\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\rrkssezi.dll,#1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2984
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\rrkssezi.dll,#1
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2996
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\rrkssezi.dll,#1
      4⤵
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of AdjustPrivilegeToken
      PID:3044
- C:\Windows\SysWOW64\autochk.exe
  "C:\Windows\SysWOW64\autochk.exe"
  2⤵
  PID:2292
- C:\Windows\SysWOW64\autochk.exe
  "C:\Windows\SysWOW64\autochk.exe"
  2⤵
  PID:2696
- C:\Windows\SysWOW64\autochk.exe
  "C:\Windows\SysWOW64\autochk.exe"
  2⤵
  PID:2312
- C:\Windows\SysWOW64\autochk.exe
  "C:\Windows\SysWOW64\autochk.exe"
  2⤵
  PID:2220
- C:\Windows\SysWOW64\autochk.exe
  "C:\Windows\SysWOW64\autochk.exe"
  2⤵
  PID:2344
- C:\Windows\SysWOW64\autochk.exe
  "C:\Windows\SysWOW64\autochk.exe"
  2⤵
  PID:2732
- C:\Windows\SysWOW64\autochk.exe
  "C:\Windows\SysWOW64\autochk.exe"
  2⤵
  PID:2864
- C:\Windows\SysWOW64\chkdsk.exe
  "C:\Windows\SysWOW64\chkdsk.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2880
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2268

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1192-8-0x00000000069A0000-0x0000000006A94000-memory.dmp

Filesize
976KB

Download
memory/1192-16-0x0000000003A90000-0x0000000003B90000-memory.dmp

Filesize
1024KB

Download
memory/1192-15-0x0000000006E10000-0x0000000006ED5000-memory.dmp

Filesize
788KB

Download
memory/1192-6-0x00000000069A0000-0x0000000006A94000-memory.dmp

Filesize
976KB

Download
memory/1192-11-0x0000000006E10000-0x0000000006ED5000-memory.dmp

Filesize
788KB

Download
memory/2880-14-0x00000000000C0000-0x00000000000E9000-memory.dmp

Filesize
164KB

Download
memory/2880-13-0x0000000000860000-0x0000000000867000-memory.dmp

Filesize
28KB

Download
memory/2880-12-0x0000000000860000-0x0000000000867000-memory.dmp

Filesize
28KB

Download
memory/2996-0-0x0000000000120000-0x0000000000122000-memory.dmp

Filesize
8KB

Download
memory/3044-5-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/3044-10-0x00000000003E0000-0x00000000003F1000-memory.dmp

Filesize
68KB

Download
memory/3044-9-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/3044-4-0x0000000000260000-0x0000000000271000-memory.dmp

Filesize
68KB

Download
memory/3044-2-0x0000000001FE0000-0x00000000022E3000-memory.dmp

Filesize
3.0MB

Download
memory/3044-1-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download

Analysis

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