gurcu | 44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

Analysis

max time kernel
64s
max time network
99s
platform
windows10-2004_x64
resource
win10v2004-20230831-en
resource tags

arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system
submitted
13-09-2023 16:29

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General

Target

B9a5797cb584014f3fede.exe
Size

530KB
MD5

862e7aeb18ba5892f51b5712a213a614
SHA1

99d86e4247f52c3ea9b2bb476af66dfc7707fa8d
SHA256

44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31
SHA512

678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713
SSDEEP

6144:XHClm6SWPoK5Z0EwVSmRPQd/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccHd8JyO:XHCnZxb88RatpvnzZjDv7oj19yTNTY

Score

10^/10

gurcu collection discovery spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot6176004110:AAFKA5be4dMwA848HWxzYIzrzzOGIHMOJGc/sendMessage?chat_id=615133582

Signatures

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu

Checks computer location settings 2 TTPs 2 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-1-5-21-4078585466-1563564224-3678410669-1000\Control Panel\International\Geo\Nation	B9a5797cb584014f3fede.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4078585466-1563564224-3678410669-1000\Control Panel\International\Geo\Nation	B9a5797cb584014f3fede.exe

Executes dropped EXE 3 IoCs

pid	Process
4428	B9a5797cb584014f3fede.exe
3880	tor.exe
4204	B9a5797cb584014f3fede.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4078585466-1563564224-3678410669-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	B9a5797cb584014f3fede.exe
Key opened	\REGISTRY\USER\S-1-5-21-4078585466-1563564224-3678410669-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	B9a5797cb584014f3fede.exe
Key opened	\REGISTRY\USER\S-1-5-21-4078585466-1563564224-3678410669-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	B9a5797cb584014f3fede.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

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
56	ip-api.com

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{F4EA2D31-687C-4ECA-9A36-98F39FF9EEF0}.catalogItem	svchost.exe
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallAgent\Checkpoints\9NCBCSZSJRSB.dat	svchost.exe
File opened for modification	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallAgent\Checkpoints\9NCBCSZSJRSB.dat	svchost.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
3596	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2252	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4428	B9a5797cb584014f3fede.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4820	B9a5797cb584014f3fede.exe
Token: SeDebugPrivilege	4428	B9a5797cb584014f3fede.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4820 wrote to memory of 4076	4820	B9a5797cb584014f3fede.exe	82
PID 4820 wrote to memory of 4076	4820	B9a5797cb584014f3fede.exe	82
PID 4076 wrote to memory of 2728	4076	cmd.exe	84
PID 4076 wrote to memory of 2728	4076	cmd.exe	84
PID 4076 wrote to memory of 2252	4076	cmd.exe	86
PID 4076 wrote to memory of 2252	4076	cmd.exe	86
PID 4076 wrote to memory of 3596	4076	cmd.exe	91
PID 4076 wrote to memory of 3596	4076	cmd.exe	91
PID 4076 wrote to memory of 4428	4076	cmd.exe	92
PID 4076 wrote to memory of 4428	4076	cmd.exe	92
PID 4428 wrote to memory of 868	4428	B9a5797cb584014f3fede.exe	94
PID 4428 wrote to memory of 868	4428	B9a5797cb584014f3fede.exe	94
PID 4428 wrote to memory of 3880	4428	B9a5797cb584014f3fede.exe	96
PID 4428 wrote to memory of 3880	4428	B9a5797cb584014f3fede.exe	96

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

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4078585466-1563564224-3678410669-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	B9a5797cb584014f3fede.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4078585466-1563564224-3678410669-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	B9a5797cb584014f3fede.exe

C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe
"C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4820
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4076
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2728
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:2252
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3596
- - C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
    "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Accesses Microsoft Outlook profiles
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    - outlook_office_path
    - outlook_win_path
    PID:4428
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp9933.tmp" -C "C:\Users\Admin\AppData\Local\gzrj1xdnai"
      4⤵
      PID:868
  - - C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
      "C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:3880

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k netsvcs -p
1⤵
- Drops file in System32 directory
PID:1052

C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
1⤵
- Executes dropped EXE
PID:4204

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\B9a5797cb584014f3fede.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

Download Submit
C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

Filesize
530KB

MD5
862e7aeb18ba5892f51b5712a213a614

SHA1
99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

SHA256
44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

SHA512
678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

Download Submit
C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

Filesize
530KB

MD5
862e7aeb18ba5892f51b5712a213a614

SHA1
99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

SHA256
44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

SHA512
678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

Download Submit
C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

Filesize
530KB

MD5
862e7aeb18ba5892f51b5712a213a614

SHA1
99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

SHA256
44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

SHA512
678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp9933.tmp

Filesize
13.3MB

MD5
89d2d5811c1aff539bb355f15f3ddad0

SHA1
5bb3577c25b6d323d927200c48cd184a3e27c873

SHA256
b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

SHA512
39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

Download Submit
C:\Users\Admin\AppData\Local\Temp\wsuDC75.tmp

Filesize
14KB

MD5
c01eaa0bdcd7c30a42bbb35a9acbf574

SHA1
0aee3e1b873e41d040f1991819d0027b6cc68f54

SHA256
32297224427103aa1834dba276bf5d49cd5dd6bda0291422e47ad0d0706c6d40

SHA512
d26ff775ad39425933cd3df92209faa53ec5b701e65bfbcccc64ce8dd3e79f619a9bad7cc975a98a95f2006ae89e50551877fc315a3050e48d5ab89e0802e2b7

Download Submit
C:\Users\Admin\AppData\Local\gzrj1xdnai\data\cached-microdesc-consensus.tmp

Filesize
2.7MB

MD5
bd62b36b142606e1413729643de9cb48

SHA1
4f4c5fb65f141a46bdc0ba272ddbd7dc13ab76a2

SHA256
ff2044265d8b66e1b0c9f8dd5fa4a9ffdf0295cc08e6805366ce1810856abda1

SHA512
1176f2adcace173689b47edde52d746c0423c5ce5674a4cb93b3ce183c0961bad71612ed016955ef1c952f8ed044ab67648c57a988b68eb73c8b553cd732a9c4

Download Submit
C:\Users\Admin\AppData\Local\gzrj1xdnai\data\cached-microdescs.new

Filesize
5.1MB

MD5
5c5df5c6aec46a7a25a228b6eafc6ebc

SHA1
e56e54573404da4b49a13093e201f46d060bb1e3

SHA256
8f424b07014c8cab7bf66e3ae7fc4ac72cbcee6ba1ba48e38535e547ee3dc301

SHA512
5257fa39cd4e7fa8774680de6748d3612cae9da8242dbb49312c6f243437cb0dd2a7802484b380e1fd84edd80a7ebdd9f92db4bf73100eed7c5644356fb99236

Download Submit
C:\Users\Admin\AppData\Local\gzrj1xdnai\host\hostname

Filesize
64B

MD5
157e51e7d35356720a1f25411e829c59

SHA1
63cd8430173d1f61e3d2fc22b009c25776bc36a5

SHA256
d35b9f1c4640f63e74732784c4cfd5881d14bbeb6d3caf34eb4c2c099235f1e7

SHA512
fe7e516a195833941fc90ec61f4fdefdfe135091e28f3daa0081c23e2231988ae09f5841d7fda36d66dcd15190fb22da938ab2c0bdffdea7b9dc5257cb171586

Download Submit
C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt

Filesize
218B

MD5
ad0f07374e1929b64c70c20cfd9244a4

SHA1
1866cbe3071bfdada6087e7541e19a99018ef8f8

SHA256
ac205f67105f6cc560ed2be7987f85416612b780494cb3d33b9a685ebf94433d

SHA512
f1110fb03a2138e1f88776c1869fcfaa1034744c25ba9324eb7aace9b6af6556347453586afd46debf8ba19e50ba4c31f7119a40cca468112f9a2c78c6c1437a

Download Submit
C:\Windows\System32\config\systemprofile\AppData\Local\Microsoft\InstallAgent\Checkpoints\9NCBCSZSJRSB.dat

Filesize
29KB

MD5
e78416815d49f6190fc5a95c765019d5

SHA1
d1889adc6eddbf08eae432218a395cca3c294183

SHA256
0c9df8ced1cbb9e492da5b4e5e21e13100940dec3719f590c7743a8c2a399837

SHA512
83580a373013d74e42c55c62b6bd9124d2fcd2b04531e257154148da840f5abf7ba0243652315ef22155579d09a9ba080f26d6b8000832cfbe5094723a0dbb2f

Download Submit
memory/4204-208-0x00007FFF3AD30000-0x00007FFF3B7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4428-11-0x00007FFF3AD30000-0x00007FFF3B7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4428-42-0x00007FFF3AD30000-0x00007FFF3B7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4428-51-0x0000028CCD7D0000-0x0000028CCD7E0000-memory.dmp

Filesize
64KB

Download
memory/4428-12-0x0000028CCD7D0000-0x0000028CCD7E0000-memory.dmp

Filesize
64KB

Download
memory/4820-6-0x00007FFF3BE90000-0x00007FFF3C951000-memory.dmp

Filesize
10.8MB

Download
memory/4820-0-0x000001BCA5B70000-0x000001BCA5BFA000-memory.dmp

Filesize
552KB

Download
memory/4820-4-0x000001BCC0240000-0x000001BCC0250000-memory.dmp

Filesize
64KB

Download
memory/4820-3-0x00007FFF3BE90000-0x00007FFF3C951000-memory.dmp

Filesize
10.8MB

Download