xtremerat | a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827

General

Target

a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827.exe
Size

902KB
MD5

0b0afbc1eb5c9a1748b8f1371887e84c
SHA1

4cadb39e4270e7a4cf226975ba5ce0bfbad59192
SHA256

a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827
SHA512

73c1a78fe4d87d505ed08da838455f371c65ac556bcc392585a2667d288398ba81aa5faae597c1916c7cef6df72a49cc1725b9cbe3f6a141882fadae79cd84d4
SSDEEP

24576:Z4lavt0LkLL9IMixoEgea5DJ4Bq9MmCS:okwkn9IMHea5DJsaPCS

Score

10^/10

xtremerat persistence rat spyware upx

Malware Config

Extracted

Family

xtremerat

C2

bt-root.ddns.net

Signatures

Detect XtremeRAT payload 5 IoCs

resource	yara_rule
behavioral2/memory/4508-135-0x0000000000000000-mapping.dmp	family_xtremerat
behavioral2/memory/3376-136-0x0000000010000000-0x000000001004D000-memory.dmp	family_xtremerat
behavioral2/memory/4508-137-0x0000000010000000-0x000000001004D000-memory.dmp	family_xtremerat
behavioral2/memory/3376-138-0x0000000010000000-0x000000001004D000-memory.dmp	family_xtremerat
behavioral2/memory/4508-139-0x0000000010000000-0x000000001004D000-memory.dmp	family_xtremerat

XtremeRAT
The XtremeRAT was developed by xtremecoder and has been available since at least 2010, and written in Delphi.
persistence spyware rat xtremerat

Executes dropped EXE 1 IoCs

pid	Process
3376	538.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0007000000022e05-133.dat	upx
behavioral2/files/0x0007000000022e05-134.dat	upx
behavioral2/memory/3376-136-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/4508-137-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/3376-138-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/4508-139-0x0000000010000000-0x000000001004D000-memory.dmp	upx

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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3900	4508	WerFault.exe	82
4692	4508	WerFault.exe	82

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 3376	1744	a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827.exe	80
PID 1744 wrote to memory of 3376	1744	a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827.exe	80
PID 1744 wrote to memory of 3376	1744	a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827.exe	80
PID 3376 wrote to memory of 4508	3376	538.exe	82
PID 3376 wrote to memory of 4508	3376	538.exe	82
PID 3376 wrote to memory of 4508	3376	538.exe	82
PID 3376 wrote to memory of 4508	3376	538.exe	82
PID 3376 wrote to memory of 3036	3376	538.exe	83
PID 3376 wrote to memory of 3036	3376	538.exe	83
PID 3376 wrote to memory of 3036	3376	538.exe	83

C:\Users\Admin\AppData\Local\Temp\a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827.exe
"C:\Users\Admin\AppData\Local\Temp\a8fbf6e88569331b344cbde17bb9269d5621e672a74a86e896b9bd30755be827.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1744
- C:\Users\Admin\AppData\Local\Temp\538\538.exe
  "C:\Users\Admin\AppData\Local\Temp\538\538.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:3376
- - C:\Windows\SysWOW64\svchost.exe
    svchost.exe
    3⤵
    PID:4508
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4508 -s 488
      4⤵
      Program crash
      PID:3900
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4508 -s 348
      4⤵
      Program crash
      PID:4692
- - C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"
    3⤵
    PID:3036

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4508 -ip 4508
1⤵
PID:4248

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4508 -ip 4508
1⤵
PID:4716

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\538\538.exe

Filesize
33KB

MD5
45359d47690a523444e4de78968d4c7e

SHA1
6e091358bf3dc4be417ed1a3d666892a8a0e76f4

SHA256
4bb9e27647b985da39aa1fe463c3650df847ab03458443927ffa7f85830b6967

SHA512
4d48cd74ed0fdc6e6d2a53a7629b331e8b4e0612908bbdfa7b02861517bea075938f0af66138ac99e82ab990d76cc78f53a9434478c6c58e5b7b653a494d63e9

Download Submit
C:\Users\Admin\AppData\Local\Temp\538\538.exe

Filesize
33KB

MD5
45359d47690a523444e4de78968d4c7e

SHA1
6e091358bf3dc4be417ed1a3d666892a8a0e76f4

SHA256
4bb9e27647b985da39aa1fe463c3650df847ab03458443927ffa7f85830b6967

SHA512
4d48cd74ed0fdc6e6d2a53a7629b331e8b4e0612908bbdfa7b02861517bea075938f0af66138ac99e82ab990d76cc78f53a9434478c6c58e5b7b653a494d63e9

Download Submit
memory/3376-132-0x0000000000000000-mapping.dmp

Download
memory/3376-136-0x0000000010000000-0x000000001004D000-memory.dmp

Filesize
308KB

Download
memory/3376-138-0x0000000010000000-0x000000001004D000-memory.dmp

Filesize
308KB

Download
memory/4508-135-0x0000000000000000-mapping.dmp

Download
memory/4508-137-0x0000000010000000-0x000000001004D000-memory.dmp

Filesize
308KB

Download
memory/4508-139-0x0000000010000000-0x000000001004D000-memory.dmp

Filesize
308KB

Download

Analysis

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